Separate slow and integration tests out to be run with fail safe

[ChrisJohnNOAA]

Description

Separate slow and integration tests out to be run with maven fail safe plugin. This allows the main unit test suite to complete much faster (while still covering most of the code).

Also adds a retry with backoff to testForBrokenLinks to make it more reliable.

Type of change

Please delete options that are not relevant.

• [ X ] Bug fix (non-breaking change which fixes an issue)

Checklist before requesting a review

• [ X ] I have performed a self-review of my code
• [ X ] My code follows the style guidelines of this project
• [ X ] I have commented my code, particularly in hard-to-understand areas
• [ X ] I have made corresponding changes to the documentation
• [ X ] My changes generate no new warnings
• [ X ] I have added tests that prove my fix is effective or that my feature works
• [ X ] New and existing unit tests pass locally with my changes

[srstsavage]

Surefire tests all pass in about 20 minutes on my test Linux machine. This is great!

[INFO] Results:
[INFO] 
[WARNING] Tests run: 347, Failures: 0, Errors: 0, Skipped: 1
[INFO] 
[INFO] 
[INFO] --- jacoco:0.8.12:report (generate-code-coverage-report) @ ERDDAP ---
[INFO] Loading execution data file /home/shane/src/erddap/target/jacoco.exec
[INFO] Analyzed bundle 'erddap' with 475 classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  21:32 min
[INFO] Finished at: 2024-09-03T10:30:28-07:00
[INFO] ------------------------------------------------------------------------