perf(tests): one Dirigible boot per class for 22 more multi-method ITs

[delchev]

What

Batch 2 of the @DirtiesContext(AFTER_CLASS) conversion (#6703 was batch 1): the remaining multi-method IT classes, audited class-by-class for shared-database honesty. 60 test methods now cost 22 Spring boots instead of 60, trimming both the api and ui CI shards (the ui shard is the current wall-clock bottleneck).

Scope

Converted as-is (18) — methods are read-only or already have honest per-method cleanup: MonitoringPerspectiveIT, IntentBuilderShellIT, MonitoringShellIT, DatabaseShellIT, ShellSwitcherIT, EnabledMultitenantModeIT, CsvProcessorIT, RepositoryExportIT, CsvimReimportIT, DocumentsApiIT, JavaBpmnIT, JavaCamelIT, PerspectiveGroupAggregationIT, JavaCompilationProblemsIT, PrintRenderIT, ArtefactStatusEndpointIT, BpmnModelApiIT, TenantConfigurationIT.

Converted with a state-honesty fix (4):

• RestTransactionsIT — new @AfterEach drops TESTTABLE and deletes the committed test user; two methods otherwise collide on both (one asserts the user exists after a commit, another asserts it's absent after a rollback).
• IntentCrossModelScheduleSourceIT — cleanup now force-syncs so the JobSynchronizer DELETE branch unschedules the published 5-second cron job (it otherwise keeps firing against unloaded gen classes for the rest of the class), and the unpublish cleanup asserts a strict 2xx instead of >=200.
• SynchronizerCleanupRaceIT — the cleanup sync runs unconditionally: the publish-bypass test unpublishes through the service without a sync, leaving a registered JavaFile whose source is gone, which makes every later client-Java rebuild defer.
• MessagingFacadeIT — the queue tests drain the broker (now persistent across methods, its JDBC store lives in SystemDB) before each method; the FIFO and receive-timeout assertions need an empty queue.

Deliberately NOT converted, with cause: MultitenancyHarmoniaIT (fixture asserts absolute row counts and empty CMIS listings — non-idempotent by construction), LocalNativeAppLifecycleIT (would leak live OS processes and duplicate default-package Server FQNs between methods), SchemaExportImportIT (whole-SystemDB export with an exclusion list tuned to a pristine database).

Verification

Two consecutive full runs of all 22 classes (fresh target/dirigible each, isolated Maven repo): 62/62 green both times (the 1 skip is the pre-existing @Disabled rollback test). mvn formatter:validate green.

With #6703 this closes out the low-risk portion of the boot-per-method cleanup; what remains for the IT-speed effort is consolidating the duplicated journeys (the 14 sample-project clones, the BPMN editor trio, CreateNewFileIT's 431s single test).

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