Template linting for TPv2

[ocket8888]

This adds some linting rules for templates in TPv2. Right now, it's spitting out a bunch of warnings, which might be disabled entirely in the future (each one has an accompanying rationale in the configuration file). It also makes the code compliant with the linting rules. The biggest change is just that all buttons now must have an explicit type attribute - even when using the implicit default submit type. That helps catch buttons that shouldn't be submit type, but also buttons incorrectly used as links etc.

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Which Traffic Control components are affected by this PR?

• Traffic Portal (experimental v2)

What is the best way to verify this PR?

Make sure the code passes the new linting rules (albeit with warnings)

PR submission checklist

• This PR has tests
• This PR doesn't need documentation
• This PR doesn't need a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY

[codecov]

Codecov Report

Merging #7462 (f393269) into master (6d6876c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #7462   +/-   ##
=========================================
  Coverage     65.43%   65.44%           
  Complexity       98       98           
=========================================
  Files           305      305           
  Lines         11616    11621    +5     
  Branches        788      790    +2     
=========================================
+ Hits           7601     7605    +4     
- Misses         3667     3669    +2     
+ Partials        348      347    -1     

Flag	Coverage Δ
traffic_portal_v2	76.42% <100.00%> (+<0.01%)	⬆️
unit_tests	76.42% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
.../src/app/core/currentuser/currentuser.component.ts	96.92% <100.00%> (+0.25%)	⬆️

... and 2 files with indirect coverage changes

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[rimashah25]

The code change looks good to me.
I tried to test the changes on local to ensure buttons and anchors are still doing what they are supposed to and I am unable to login since login button is not working. So, I can't test any other buttons.

[rimashah25]

LGTM. Tested locally button/link changes for login/users/physicalLocations/server/cachegroup. Unable to test deliveryservice or anything related to it.