Removing v5 client methods for Delivery Service Required Capabilities

[srijeet0406]

This PR closes #7801
This PR removes unneeded client methods for Delivery Service Required Capabilities.

---

Which Traffic Control components are affected by this PR?

• Documentation
• Traffic Control Client Golang
• Traffic Ops
• CDN in a Box

What is the best way to verify this PR?

Make sure CDN in a box builds and functions as expected.
Make sure all the tests pass.

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 #7804 (bf28c2e) into master (75ec56f) will decrease coverage by 36.20%.
Report is 139 commits behind head on master.
The diff coverage is 40.18%.

@@              Coverage Diff              @@
##             master    #7804       +/-   ##
=============================================
- Coverage     65.05%   28.85%   -36.20%     
  Complexity       98       98               
=============================================
  Files           314      600      +286     
  Lines         12365    77193    +64828     
  Branches        907       90      -817     
=============================================
+ Hits           8044    22275    +14231     
- Misses         3968    52833    +48865     
- Partials        353     2085     +1732     

Flag	Coverage Δ
golib_unit	53.56% <54.37%> (?)
grove_unit	12.02% <ø> (?)
t3c_unit	5.80% <2.74%> (?)
traffic_monitor_unit	26.44% <ø> (?)
traffic_ops_integration	69.42% <ø> (+<0.01%)	⬆️
traffic_ops_unit	21.50% <ø> (?)
traffic_portal_v2	?
traffic_stats_unit	10.78% <ø> (?)
unit_tests	25.64% <40.18%> (-48.14%)	⬇️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.58% <ø> (-0.06%)	⬇️

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

Files Changed	Coverage Δ
cache-config/t3c-apply/config/config.go	0.00% <0.00%> (ø)
cache-config/t3c-apply/torequest/cmd.go	0.00% <0.00%> (ø)
cache-config/t3c-check-refs/t3c-check-refs.go	1.78% <0.00%> (ø)
cache-config/t3c-generate/cfgfile/varnish.go	0.00% <0.00%> (ø)
cache-config/t3c-generate/config/config.go	0.81% <0.00%> (-0.08%)	⬇️
cache-config/t3c-generate/t3c-generate.go	0.00% <ø> (ø)
lib/go-atscfg/parentabstraction.go	79.47% <ø> (ø)
lib/go-tc/cdns.go	0.00% <ø> (ø)
lib/go-tc/deliveryservice_servers.go	0.00% <0.00%> (ø)
lib/go-tc/federation_resolver.go	45.45% <0.00%> (ø)
... and 13 more

... and 486 files with indirect coverage changes

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[rimashah25]

LGTM