[moneytool]

Issue #, if available: Fixes #4774

Description of changes:

• Root cause: scripts/update_schemas_from_aws_api.py adds shortened engine versions only for postgres (major) and aurora-mysql (major.minor). As a result the mysql and mariadb enums contain only full X.Y.Z versions, and a major-only EngineVersion such as "8.0" (mysql) or "10.11" (mariadb) fails E3691, even though RDS accepts it. AWS::RDS::DBCluster with Engine: mysql has the same problem under E3690.
• Change: following Allow for major versions for postgres #3850, write_db_instance now derives major.minor values for mysql and mariadb, and write_db_cluster does the same for mysql.
• Deprecation rules (W3691/W3690): the *_deprecated writers are left unchanged on purpose. Deriving majors there the way aurora-mysql does would mark a major as deprecated as soon as any one of its minors is, so mysql 8.0 would pass E3691 but trip W3691. The trade-off is that a major whose minors are all deprecated (mysql 5.7, mariadb 10.5) now passes E3691 without a W3691 warning. Flagging only those majors would need the deprecated writers to see the available versions too; happy to do that here or in a follow-up if you prefer.
• Data: I regenerated aws_rds_dbinstance/engine_version.json (+16: 5 mysql, 11 mariadb) and aws_rds_dbcluster/engine_version.json (+5 mysql) by running the script's own writer functions on the versions already in those files, so no AWS API call was made. Before the script change, the same run reproduced both files byte-for-byte.
• Tests: added tests that run E3691 and E3690 against the shipped schemas. They check that mysql 8.0/8.4 and mariadb 10.11/11.4 pass, that postgres 16 and aurora-mysql 8.0 still pass, and that an invalid 9.99 still fails. The new major-only cases fail without the data change. No snapshot changes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.68%. Comparing base (a08bf36) to head (bf38945).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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##             main    #4796   +/-   ##
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  Coverage   94.68%   94.68%           
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  Files         439      439           
  Lines       16004    16004           
  Branches     3108     3108           
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  Hits        15153    15153           
  Misses        468      468           
  Partials      383      383           

Flag	Coverage Δ
unittests	94.67% <ø> (ø)

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