Adding CDN lock check for invalidation jobs

[srijeet0406]

This PR is not related to any issue. It makes sure that is a user has a hard lock on a CDN, no other user can create invalidation jobs on that CDN.

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Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Run TO and TP.
As user A, hard lock a CDN
As user B, login and try to create an invalidation job on the same CDN
Make sure that the request fails

If this is a bugfix, which Traffic Control versions contained the bug?

• master

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Merging #7441 (3ca7bed) into master (096ef2a) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #7441      +/-   ##
============================================
- Coverage     29.22%   29.22%   -0.01%     
  Complexity       98       98              
============================================
  Files           781      781              
  Lines         81527    81537      +10     
  Branches        779      779              
============================================
  Hits          23826    23826              
- Misses        55653    55663      +10     
  Partials       2048     2048              

Flag	Coverage Δ
golib_unit	48.40% <ø> (ø)
grove_unit	4.60% <ø> (ø)
t3c_unit	5.32% <ø> (ø)
traffic_monitor_unit	21.28% <ø> (ø)
traffic_ops_integration	69.42% <ø> (ø)
traffic_ops_unit	22.71% <0.00%> (-0.01%)	⬇️
traffic_portal_v2	64.24% <ø> (ø)
traffic_stats_unit	10.14% <ø> (ø)
unit_tests	26.16% <0.00%> (-0.01%)	⬇️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.63% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ic_ops_golang/invalidationjobs/invalidationjobs.go	0.00% <0.00%> (ø)

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[rimashah25]

Code changes LGTM
Tested on local: Hard Locked a CDN as an admin user, logged in as an ops user and tried invalidate content but the lock prevented to do so.