fix(firestore): Move createIndexes calls

[bhshkh]

Fixes #9039

Issue: createIndexes is a setup step that is executed before running any of the tests. It is failing intermittently with context deadline exceeded error

Cause: Index creation takes too long

Fix:

1. Create lesser number of indexes
2. Move index creation to the tests that use those indexes so that rest of the tests can run even if the index creation fails
3. Set higher context deadline

[bhshkh]

Do not merge until release freeze ends mid April