Fixed error message for assignment of non-existent parameters to a profile

[rimashah25]

Closes: #6229

---

Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Using curl cmd, call api: profileparameter with a post body as follows (eg). Note: 14, 30, 400 are non-existent parameter

{
    "profileId": 10,
    "paramIds": [14, 13, 400, 1]
}

and you should see the following message

{"alerts":
    [{
         "text":"parse error: validating: parameters with IDs [14 13 400] don't all exist",
         "level":"error"
     }]
}

Note, 1 didn't show up since it is an existing parameter.

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

7.0.1

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 #7241 (b43d921) into master (bf8e18f) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master    #7241   +/-   ##
=========================================
  Coverage     28.37%   28.37%           
  Complexity       98       98           
=========================================
  Files           617      617           
  Lines         69197    69205    +8     
  Branches         90       90           
=========================================
+ Hits          19634    19638    +4     
- Misses        47754    47758    +4     
  Partials       1809     1809           

Flag	Coverage Δ
golib_unit	53.07% <0.00%> (-0.01%)	⬇️
grove_unit	4.60% <ø> (ø)
t3c_generate_unit	24.96% <ø> (ø)
traffic_monitor_unit	20.43% <ø> (ø)
traffic_ops_unit	19.81% <ø> (ø)
traffic_stats_unit	10.41% <ø> (ø)

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

Impacted Files	Coverage Δ
lib/go-tc/parameters.go	0.00% <0.00%> (ø)
lib/go-atscfg/serverunknown.go	77.96% <0.00%> (-1.70%)	⬇️
lib/go-atscfg/strategiesdotconfig.go	91.78% <0.00%> (+0.03%)	⬆️
lib/go-atscfg/ipallowdotyaml.go	71.61% <0.00%> (+0.25%)	⬆️
lib/go-atscfg/ipallowdotconfig.go	69.62% <0.00%> (+0.28%)	⬆️

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