text: Title: DVC and syrupy. .dvc tracking files deleted by "pytest --snapshot-update"
  Body: **Describe the bug**
  
  [DVC](https://dvc.org/) is a tool that combines git and external storage to track large files that shouldn't be added to the git repository but that need to be tracked and stored. For a PNG file like `__snapshots__/test_image/test_image.jpeg` running
  
      ```
      dvc add __snapshots__/test_image/test_image.jpeg
      ```
  
  will
  
  1. add a `.gitignore` entry for the file `__snapshots__/test_image/test_image.jpeg`
  2. create a file `__snapshots__/test_image/test_image.jpeg.dvc` to track the file
  3. execute `git add __snapshots__/test_image/test_image.jpeg.dvc .gitignore`
  
  Then you use `git commit; dvc push; git push` to copy everything to the storage and repositories.
  
  So the snapshots created by syrupy are still in the working copy of the repository, but now there are .dvc files next to them. A new git clone will not include the syrupy snapshots until `dvc pull` is executed.
  
  When I ran pytest, syrupy reported
  
      ```
      9 snapshots passed. 7 snapshots unused.
  
      Re-run pytest with --snapshot-update to delete unused snapshots.
      ```
  
  So I did `pytest --snapshot-update` and the .dvc files under the `__snapshots__` directory
  were deleted. `git restore` brought them back.
  
  **To reproduce**
  
  Note: This uses bash commands to create a .dvc file that will be deleted
  by running `pytest --snapshot-update`. This simplifies the reproduction steps.
  
  1. mkdir dvc-and-syrupy
  2. cd dvc-and-syrupy
  3. pipenv --python 3.7
  4. pipenv shell
  5. git init
  6. wget https://raw.githubusercontent.com/tophat/syrupy/main/tests/examples/test_custom_image_extension.py
  7. python -m pip install pytest syrupy
  8. pytest --snapshot-update
  9. git status
  
      ```bash
      On branch master
  
      No commits yet
  
      Untracked files:
        (use "git add <file>..." to include in what will be committed)
              Pipfile
              __snapshots__/
              dvc-and-syrupy.md
              test_custom_image_extension.py
  
      nothing added to commit but untracked files present (use "git add" to track)
      ```
  
  10. echo "this is a test dvc file" > __snapshots__/test_custom_image_extension/test_jpeg_image.jpg.dvc
  11. echo "/test_jpeg_image.jpg" >> __snapshots__/test_custom_image_extension/.gitignore
  12. git add __snapshots__/ test_custom_image_extension.py
  13. git status
  
      ```bash
      On branch master
  
      No commits yet
  
      Changes to be committed:
        (use "git rm --cached <file>..." to unstage)
              new file:   __snapshots__/test_custom_image_extension/.gitignore
              new file:   __snapshots__/test_custom_image_extension/test_jpeg_image.jpg.dvc
              new file:   test_custom_image_extension.py
  
      Untracked files:
        (use "git add <file>..." to include in what will be committed)
              Pipfile
      ```
  
  14. git commit -m "dvc tracking of snapshots"
  
      ```bash
      [master (root-commit) 90fb787] dvc tracking of snapshots
       3 files changed, 44 insertions(+)
       create mode 100644 __snapshots__/test_custom_image_extension/.gitignore
       create mode 100644 __snapshots__/test_custom_image_extension/test_jpeg_image.jpg.dvc
       create mode 100644 test_custom_image_extension.py
      ```
  
  15. pytest --snapshot-update
  
      ```bash
      =============================================================== test session starts ===============================================================
      platform linux -- Python 3.7.13, pytest-7.2.1, pluggy-1.0.0
      rootdir: /home/jason/mm/dvc-and-syrupy
      plugins: syrupy-3.0.6
      collected 1 item
  
      test_custom_image_extension.py .                                                                                                            [100%]
  
      ------------------------------------------------------------- snapshot report summary -------------------------------------------------------------
      1 snapshot passed. 1 unused snapshot deleted.
  
      Deleted unknown snapshot fossil (__snapshots__/test_custom_image_extension/test_jpeg_image.jpg.dvc)
      ================================================================ 1 passed in 0.02s ================================================================
      ```
  
  16. git status
  
      ```bash
      On branch master
      Changes not staged for commit:
        (use "git add/rm <file>..." to update what will be committed)
        (use "git restore <file>..." to discard changes in working directory)
              deleted:    __snapshots__/test_custom_image_extension/test_jpeg_image.jpg.dvc
  
      Untracked files:
        (use "git add <file>..." to include in what will be committed)
              Pipfile
  
      no changes added to commit (use "git add" and/or "git commit -a")
      ```
  
  **Expected behavior**
  
  It would be nice to have a way to tell syrupy that
  certain files, or file patterns, under the snapshot folder should be ignored.
  
  **Screenshots**
  
  N/A
  
  **Environment (please complete the following information):**
  
  - OS: Ubuntu 18.04 but it's not an OS issue
  - Syrupy Version: 2.
  - Python Version: 3.7.13
  
  **Additional context**
  
  Right now I have in my repos, .gitignore, .dockerignore, .dvcignore, .jshintignore,
  .npmignore, .prettierignore, .eslintignore..... Perhaps it's a sign that a tool has
  reached a certain maturity when it accepts guidance on how to ignore unexpected files in
  it's sandbox.
  