Closes gh-23425

* gh-23418:
  Polish "Add note about Kotlin main class name"
  Add note about Kotlin main class name

Closes gh-23418

See gh-23418

See gh-23418

Closes gh-23416

Closes gh-23415

Previously, spring.flyway.init-sqls was only applied to Flyway's
configuration if Flyway was being configured to create the DataSource.
If Flyway was being configured to use an existing DataSource, init-sqls
was not applied. This is a hangover from when the init SQLs support was
introduced. At that time, Flyway only supported SQL to initialize the
connection when it was creating the DataSource. Flyway 5.2 added init
SQL support no matter how Flyway's DataSource was configured.

This commit updates FlywayAutoConfiguration to always apply the
init-sqls property to Flyway's configuration. The property's
documentation does not describe the current limitation so this change
should align the behaviour with what the documentation leads people to
expect.

Fixes gh-23392

Fixes gh-23402

Closes gh-23388

Closes gh-23186

Closes gh-23384

Closes gh-23185

Closes gh-23198

Closes gh-23374

Closes gh-23375

Closes gh-23374

Closes gh-23372

Closes gh-23371

Closes gh-23195

Closes gh-23194

Closes gh-23340

Closes gh-23336

Closes gh-23335

Closes gh-23334

Closes gh-23333

Closes gh-23332

Closes gh-23331

Closes gh-23325

Ensure that the source jar entry is closed before reading
certificates and code signers from the entry.

gh-19041