Add new rule: disallow focus containers

[nunnatsa]

Description

Focus ginkgo containers (FDescribe, FContext, FWhen, and FIt) should only be used locally, on debug.

This PR introduces a new rule to prevent the leaking of this kind of debug code into the source code in the repo.

New suppress comment to suppress this new rule: // ginkgo-linter:ignore-focus-container-warning

New command line flag to suppress this new rule: --suppress-focus-container

Fixes https://github.com/kubevirt/kubevirt/issues/10120

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] Added test case and related test data
• [x] Update the functional test

Checklist:

• [x] I have performed a self-review of my own code
• [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
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I ran golangci-lint

@nunnatsa

[nunnatsa]

/cc @lyarwood @iholder101

[coveralls]

Pull Request Test Coverage Report for Build 5577287155

• 61 of 80 (76.25%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.7%) to 83.925%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
types/config.go	2	3	66.67%
ginkgo_linter.go	47	49	95.92%
ginkgohandler/handler.go	12	28	42.86%
<!--	Total:	61	80	76.25%	-->

Files with Coverage Reduction	New Missed Lines	%
types/config.go	1	34.15%
<!--	Total:	1		-->

Totals
Change from base Build 5542098039:	-0.7%
Covered Lines:	898
Relevant Lines:	1070

---

💛 - Coveralls

[iholder101]

Sorry for the late response. Thanks a lot @nunnatsa!!