feat: improve apply_to_all handling in upload forms

[peterthomassen]

• Relabel apply_to_all field because old text caused confusion ("what is being applied?")
• Set apply_to_all=False by default for uploading slides (as per the apparently common usecase)

[rjsparks]

Hi Peter - thanks for this.
A question for future chair training - where did you run into the pain that led you to choose to contribute these changes? What can we do (beyond the changes you suggest here) to help others avoid that pain?

[peterthomassen]

It was just that I (not a chair) was submitting slides, and asked our WG chair what that checkbox meant, because it wasn't clear to me. It was explained to me, together with the comment that they (the WG chairs) always untick that box during approval because slide decks usually go to only the session where they will be presented. So I thought it makes sense to set it to false initially.

As for what else to do, I think nothing is really needed beyond making clear what the checkbox means.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (70bf2ae) to head (cf1b6b8).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8680      +/-   ##
==========================================
- Coverage   88.88%   88.80%   -0.08%     
==========================================
  Files         312      314       +2     
  Lines       40891    41243     +352     
==========================================
+ Hits        36345    36627     +282     
- Misses       4546     4616      +70     

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[rjsparks]

Please see https://mailarchive.ietf.org/arch/browse/wgchairs/?q=subject%3A(apply%20to%20all%20sessions)
I'll hold this PR for now, but it's likely that we'll close and not merge it, in favor of a refactor of the upload process instead that moves the checkbox to the approver rather than the submitter.

[peterthomassen]

Fine with me. However,

• if I'm not mistaken the checkbox is already on the approve form (see ApproveSlidesForm), so the task would be merely to remove it from the upload form (happy to adjust this PR accordingly);
• the question remains open what the default value of this setting should be.

It seems to be that the default ideally should be a WG property, but my gut feeling is that that's unnecessarily complex.

[rjsparks]

I'll shift this to draft as part of holding it aside.