Disable query limits for some additional specs in spec/features/boards/boards_spec.rb

What does this MR do and why?

Use

inspect_requests(inject_headers: { 'X-GITLAB-DISABLE-SQL-QUERY-LIMIT' => 'https://gitlab.com/gitlab-org/gitlab/-/issues/323426' })

to disable all query checks in https://gitlab.com/gitlab-org/gitlab/blob/master/spec/features/boards/boards_spec.rb

This is because we're seeing flaky behavior with these specs. Already many of the tests in this file disable the query count. Here we will extend that to all of them in order to avoid the random failures in CI.

Example failures in CI:

• https://gitlab.com/gitlab-org/gitlab/-/jobs/3415383179
• https://gitlab.com/gitlab-org/gitlab/-/jobs/3410190558

The tests themselves are not being quarantined, just the SQL query limit check is being disabled.

See also !105849 (comment 1197129526), where it seems like let_it_be may be the main culprit.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.

Related to #383970 (closed) and #323426