[Executorch][BE] Rename sdpa_with_kv_cache.py to custom_ops.py

[kimishpatel]

Stack from ghstack (oldest at bottom):

• 6997

• -> #6996

• 6914

• 5715

• 5670

Because now we have more than sdpa_with_kv_cache in it

Differential Revision: D66269486

[pytorch-bot[bot]]

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As of commit 02e0608681d171de490b7c3b771337b20d0c2a30 with merge base 43555d21c289669ecacca5cd46d9a9018c6d7f7c (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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This pull request was exported from Phabricator. Differential Revision: D66269486