Add a pre-check for E2E tests

[fgksgf]

Type of change:

• CI

What this PR does / why we need it:

In #949 we use ginkgo --focus to run test cases in parallel, but some newly added cases may not follow the naming convention. So we need to add a pre-check to avoid some E2E cases not running.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

Test

Tested on Linux:

[fgksgf]

The script can find we missed the prefix in some files:

https://github.com/apache/apisix-ingress-controller/runs/5881903560?check_suite_focus=true

[codecov-commenter]

Codecov Report

Merging #957 (f4a1078) into master (4bdc947) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #957   +/-   ##
=======================================
  Coverage   31.75%   31.75%           
=======================================
  Files          72       72           
  Lines        7935     7935           
=======================================
  Hits         2520     2520           
  Misses       5139     5139           
  Partials      276      276           

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[tao12345666333]

The script can find we missed the prefix in some files

Great!!

[tao12345666333]

re-run CI.

[tao12345666333]

Should we add a check-e2e-name rule to the Makefile? It might be more convenient

[fgksgf]

Should we add a check-e2e-name rule to the Makefile? It might be more convenient

Good idea

[tao12345666333]

LGTM