Fix LIKE on non-String fields failing on PostgreSQL

[clayly]

Summary

The like() and notLike() methods in SpecificationBuilder handle RSQL wildcard queries like id==* by translating them to SQL LIKE '%'. When applied to non-String columns (e.g. bigint), this fails on PostgreSQL and compatible databases with:

ERROR: operator does not exist: bigint ~~ text

The existing code had a fallback that caught Hibernate's CoercionException to convert this to IS NOT NULL, but:

1. The project uses EclipseLink, not Hibernate — so the exception was never thrown
2. EclipseLink sends the invalid SQL directly to the database, which rejects it
3. This means the test DeploymentManagementTest.verifyActionVisibility has never passed on PostgreSQL — only on H2

The fix moves the non-String field check before building the SQL predicate, making it both database-agnostic and JPA-provider-agnostic. The semantic equivalence is preserved: LIKE '%' on a non-null column matches all rows, same as IS NOT NULL.

Changes

• SpecificationBuilder.like(): early return isNotNull() when sqlValue is % and field is non-String
• SpecificationBuilder.notLike(): early return isNull() for the same case
• Removed the now-unnecessary try/catch and unused PersistenceException import

Test plan

• DeploymentManagementTest.verifyActionVisibility passes on H2 (default)
• DeploymentManagementTest.verifyActionVisibility passes on PostgreSQL 15
• DeploymentManagementTest.verifyActionVisibility passes on YugabyteDB (PostgreSQL 15.12-YB-2025.2.2.2-b0)

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[clayly]

Hi everyone! It follows the goal of #3007, but fixes issue of slightly other kind.