Fix race condition in async java migrations

[xin-hedera]

Description:

This PR fixes the race condition in async java migrations:

• Run async part of async java migrations after flyway migrate operation completes
• Move performSynchronousSteps() and the conditional onSuccess() to post AFTER_MIGRATE_OPERATION_FINISH callback

Related issue(s):

Fixes #11643

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
❌ -32.73% (target: -1.00%)	✅ 86.96%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (12cf97b)	36294	34023	93.74%
Head commit (e2f12ef)	59731 (+23437)	36442 (+2419)	61.01% (-32.73%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#11645)	23	20	86.96%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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