docs: refresh test resources guide

[alvarosanchez]

Summary

• Refresh the Test Resources guide wording around service lifecycle and shared servers.
• Update the MySQL Test Resources dependency example to the current com.mysql:mysql-connector-j coordinates managed by the Micronaut Platform BOM.

Validation

• ./gradlew publishGuide could not run because this repository does not include gradlew; it uses Maven site generation instead.
• ./mvnw -pl micronaut-maven-plugin -am site:site -DskipTests — passed.
• Local generated-site link check over micronaut-maven-plugin/target/site/**/*.html — 0 missing local links.
• Throwaway Micronaut Platform 5.0.2 Maven project resolved com.mysql:mysql-connector-j without an explicit version to 9.7.0; the old mysql:mysql-connector-java coordinates resolve only through Maven relocation warnings.

Paperclip: DEV-1308

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[Copilot]

Pull request overview

Refreshes the Micronaut Maven Plugin Test Resources documentation to better describe the test resources service lifecycle/shared-server behavior and updates the MySQL connector example to the current Maven coordinates managed by the Micronaut Platform BOM.

Changes:

• Reworded the introduction to clarify that the Maven plugin manages the Test Resources service lifecycle.
• Corrected wording around shared vs per-module Test Resources servers (“separate from”).
• Updated the MySQL connector dependency example to com.mysql:mysql-connector-j.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud