fix!: remove indexing for timestamps

[hongalex]

What type of PR is this?

/kind fix

What this PR does / Why we need it:
Removes indexing for all timestamps since it breaks best practices around monotonically increasing values.

Which issue(s) this PR fixes:

Special notes for your reviewer:
This requires changes on the Open Saves collector, which previously depended on the use of the Timestamps fields to select entities older than a certain time. Now, we fetch all blobs/chunks with a status and only selectively delete.

This is also a breaking change to QueryRecords since we will no longer support querying by ascending/descending timestamps.

[hongalex]

The tests that are failing are only part of the collector and they are failing on main as well.

[hongalex]

Fixed the failing collector tests. PTAL @loranger2k

[ghost]

Looks good.

We may want to eventually update the index.yaml examples to use the record key as a prefix to follow best practices and discourage the use of monotonically increasing properties are strongly discouraged.