GCP: fix config period value when the given value is below the minimum allowed period.

[Linu-Elias]

Proposed commit message

Currently GCP module errors when a period less than a minimum given by GCP APIs is specified. It should not produce an error, correct the value to the minimum and produce a warning log message.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Disruptive User Impact

• [ ]

• Closes [Metricbeat] GCP module should not error when period is less than minimum #30434

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @Linu-Elias? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit