Handle team with inactive team-type when viewing change-type

[knolleary]

Fixes #4463

Description

The changeType component assumed the current team's type would be in the list of active team types retrieved from the backend.

However, if the current team's type was inactive, then it wouldn't be in the response - and this.input.teamType would end up being null - causing various breakage of the page.

This fixes it by reverting to this.team.type if necessary. It also adds a message to the form to let the user know their current type is unavailable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.13%. Comparing base (19bbc15) to head (dfa35f2).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4464   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files         296      296           
  Lines       14119    14119           
  Branches     3189     3189           
=======================================
  Hits        11032    11032           
  Misses       3087     3087           

Flag	Coverage Δ
backend	78.13% <ø> (ø)

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