Add project.ignore to .buckconfig to reduce watched files

[dbort]

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Some CI jobs can fail with "OS file watch limit reached" when running buck2. This section should reduce the number of files that it tries to watch.

Differential Revision: D56857491

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3468

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:white_check_mark: No Failures

As of commit 8e1f6622fb1262c771e25cc8697b885f534065d8 with merge base 5d2a17b29f57ab77f0481ca1d96d827e610dc4bf (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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@dbort merged this pull request in pytorch/executorch@e098cff1d15c21c16f8d9ea963aa76a98250afad.