Add no-op placeholder migrations for the numbering to be continuous

[m-sz]

Description

We needed to revert migrations V098, V099, and V097 was spelled wrongly (lowercase v). Since then V100 has been added and it makes flyway complain about missing interim migrations.

Adding no-op migrations is enough to keep the continuity.

Changes

Adds no-op migrations V097, V098 and V099

[github-actions]

Reminder: Please update the DB Readme and comment whether migrations are reversible (include rollback scripts if applicable).

• If creating new tables, update the tables list.
• When adding a new index, consider using CREATE INDEX CONCURRENTLY for tables involved in the critical execution path.
• For breaking changes, remember that during rollout k8s starts the new autopilot, runs the Flyway migration, and only then shuts down the old pod. That overlap means the previous version can still be processing requests on the migrated schema, so make it compatible first and ship the breaking DB change in the following release.

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Caused by:

• database/sql/V097__no_op_placeholder.sql
• database/sql/V098__no_op_placeholder.sql
• database/sql/V099__no_op_placeholder.sql
• database/sql/v097__drop_old_cancellation_index.sql

[squadgazzz]

Please add a clearer description explaining why this is even required (because we have to keep the V100 migration, which breaks flyway). I assume without V100 it should have worked with no issue.

[MartinquaXD]

Given hat flyway also complains about the incorrect file name of 097 (IIRC) could you please also replace that file with a correctly named placeholder?

[jmg-duarte]

Please add a clearer description explaining why this is even required (because we have to keep the V100 migration, which breaks flyway). I assume without V100 it should have worked with no issue.

Could we also add them to the SQL file? It can be short, but something would be helpful for future reference, for example

-- Migration was omitted to keep numbering continuity, for more information see issues #4096, ...

[m-sz]

@jmg-duarte sure, I like that