0valt/1732/close reasons

[Oaphi]

closes #1732

This PR ensures close reason names are validated for both minimum & maximum length (the latter is just so as crafty users aren't "rewarded" with a server error).

It also fixes lack of visible validation errors when trying to update (we've fixed the create action earlier) an invalid close reason:

[ArtOfCode-]

Approved but has conflicts.

[Oaphi]

Approved but has conflicts.

Yeah, due to #1733 - will solve shortly

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.80%. Comparing base (00a8551) to head (3f9f144).
⚠️ Report is 11 commits behind head on develop.

Additional details and impacted files

Components	Coverage Δ
controllers	69.20% <100.00%> (+0.15%)	⬆️
helpers	79.01% <ø> (ø)
jobs	48.57% <ø> (ø)
models	85.92% <100.00%> (+0.01%)	⬆️

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