QA: precise license log
What does this MR do and why?
Updating QA's license logging, in order to debug #375886 (closed)
New logging allows precise identification of license while not revealing too much information. (Originally it outputs last 5 characters but that's common across all licenses anyways).
Log license count in order to see if there are problems with License caching.
Outputs GITLAB_LICENSE_MODE
as that's the variable name set in https://gitlab.com/gitlab-org/gitlab-qa/-/blob/master/lib/gitlab/qa/component/gitlab.rb#L61, not TEST_LICENSE_MODE
.
MR acceptance checklist
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Related to #375886 (closed)