fix: Fix improper policy checking

[filipecabaco]

What kind of change does this PR introduce?

• Presence had a bad check when tracking changes
• JWT checking had a bad check and a broken test
• Fixed some migrations to be less susceptible to errors on migrations
• Added one connection to db_pool
• Removed one connection from subcriber_pool_size

[vercel[bot]]

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **realtime-demo** | ⬜️ Ignored ([Inspect](https://vercel.com/supabase/realtime-demo/2Ji5fTDcVgiqMsJZZM65GwKDZ8aX)) | [Visit Preview](https://realtime-demo-git-fix-improper-policy-checking-supabase.vercel.app) | | Jul 2, 2024 8:11am |

[kiwicopple]

:tada: This PR is included in version 2.29.15 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[notion-workspace[bot]]

Syncing presence state should be a read operation

[fullstackwebdev]

this is broken code