chore(plan): Disable legacy plans on change

[Aradhya-Tripathi]

• Don't allow change to legacy plan.
• Don't allow new server on legacy plan.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.78%. Comparing base (4305d7e) to head (4566d84).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
press/api/server.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4806      +/-   ##
===========================================
- Coverage    50.78%   50.78%   -0.01%     
===========================================
  Files          846      846              
  Lines        67733    67734       +1     
  Branches       283      283              
===========================================
- Hits         34401    34397       -4     
- Misses       33304    33309       +5     
  Partials        28       28              

Flag	Coverage Δ
dashboard	72.89% <ø> (ø)

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