Fixed t3c for layered profile order issue

[jpappa200]

when layered profiles are used, t3c was not iterating through the profiles in the proper order,
which was causing duplicate parameters to be incorrectly overridden

---

Which Traffic Control components are affected by this PR?

• Traffic Control Cache Config (t3c, formerly ORT)

What is the best way to verify this PR?

run the unit test for layered profiles, otherwise build and install t3c setup layered profiles on a cache and
have 2 or more parameters with the same config file and name but different values. run t3c and verify
duplicate parameters have been overridden by the profile with the highest priority.

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

• trafficcontrol-cache-config-7.1.0-12303.79ed7a01

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)

[traeak]

These fixes look good and just reverse the profile evaluation (not that i like the back to front eval but that ship has sailed).

[codecov]

Codecov Report

Merging #7425 (b72c798) into master (f7765ff) will increase coverage by 0.01%.
The diff coverage is 86.66%.

@@             Coverage Diff              @@
##             master    #7425      +/-   ##
============================================
+ Coverage     27.03%   27.04%   +0.01%     
  Complexity       98       98              
============================================
  Files           685      685              
  Lines         77279    77301      +22     
  Branches         90       90              
============================================
+ Hits          20892    20908      +16     
- Misses        54399    54405       +6     
  Partials       1988     1988              

Flag	Coverage Δ
golib_unit	48.39% <86.66%> (+0.04%)	⬆️
grove_unit	4.60% <ø> (ø)
t3c_unit	5.32% <ø> (ø)
traffic_monitor_unit	20.43% <ø> (ø)
traffic_ops_unit	22.19% <ø> (ø)
traffic_stats_unit	10.14% <ø> (ø)
unit_tests	23.60% <86.66%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
lib/go-atscfg/parentdotconfig.go	65.22% <85.00%> (+0.29%)	⬆️
lib/go-atscfg/atscfg.go	58.23% <100.00%> (ø)

... and 2 files with indirect coverage changes

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