cherry-pick(release-v1.4.x): ci: cleanup security checks

[service-binding-operator-bot]

Changes

This contains two improvements:

• I misconfigured our periodic security checks back in 39908ed, and it wasn't caught in review. Turns out it was rather unnecessary with the checks we have in merge-to-master and merge-to-release-branch. The neutral checks we're seeing are caused by something else; I'll need to investigate to figure out what's going on.
• Rather than waiting within the job itself, we can have the jobs for security checks get triggered when the push to quay is done in both the merge-to-master and merge-to-release-branch is done. It should save a few seconds during checks, and it means we won't have a runner waiting doing nothing.

/kind bug

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs
  included if any changes are user facing
• Tests
  included if any functionality added or changed. For bugfixes please include tests that can catch regressions
• All acceptance test scenarios included in the PR which verifies a bugfix or a requested feature reported by a non-member are tagged with @external-feedback tag.
• Follows the commit message standard

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

Approval requirements bypassed by manually added approval.

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The full list of commands accepted by this bot can be found here.

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[codecov]

Codecov Report

Merging #1497 (b50f805) into release-v1.4.x (f01d55b) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-v1.4.x    #1497   +/-   ##
===============================================
  Coverage           58.16%   58.16%           
===============================================
  Files                  35       35           
  Lines                3014     3014           
===============================================
  Hits                 1753     1753           
  Misses               1093     1093           
  Partials              168      168           

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