WD-7718 - feat: Remove additional controllers feature

[vladimir-cucu]

Done

• Removed additional controllers feature.

QA

• Verify that "Register a controller" button does not appear in controllers page.
• Verify that /controllers?panel=register-controller route doesn't open the register controller panel.
• Verify that artifacts related to additional controller feature have been removed.

Details

• https://warthogs.atlassian.net/browse/WD-7718

Screenshots

[webteam-app]

Demo starting at https://juju-dashboard-1676.demos.haus

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (08a85c5) 94.95% compared to head (34c608a) 94.93%.

Files	Patch %	Lines
src/store/app/thunks.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1676      +/-   ##
==========================================
- Coverage   94.95%   94.93%   -0.03%     
==========================================
  Files         178      177       -1     
  Lines        5238     5170      -68     
  Branches     1515     1500      -15     
==========================================
- Hits         4974     4908      -66     
+ Misses        244      242       -2     
  Partials       20       20              

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[huwshimi]

Looks good. Just need to confirm this feature can be removed before we merge it.

[huwshimi]

@vladimir-cucu one other thing we should remove in this PR is the docs for adding additional controllers: https://github.com/canonical/juju-dashboard/blob/main/HACKING.md#adding-additional-controllers.

[vladimir-cucu]

Looks good. Just need to confirm this feature can be removed before we merge it.

I converted the PR to draft, so that we do not merge it by mistake until the feature is confirmed.

@vladimir-cucu one other thing we should remove in this PR is the docs for adding additional controllers: https://github.com/canonical/juju-dashboard/blob/main/HACKING.md#adding-additional-controllers.

Done! Thanks for the review.