feat: Return to expected schedule after editing sessions/timeslots

[jennifer-richards]

Fixes #3591.

The "Edit rooms" button from the timeslot editor still leads off into the secr app. I did not update that to return cleanly - still have to use browser history or navigate back through the agenda list. When we replace the secr app for editing rooms we can clean this up.

[codecov]

Codecov Report

Merging #5158 (5982ab1) into main (e280b25) will increase coverage by 0.03%.
The diff coverage is 82.48%.

❗ Current head 5982ab1 differs from pull request most recent head 4832d79. Consider uploading reports for the commit 4832d79 to get more accurate results

@@            Coverage Diff             @@
##             main    #5158      +/-   ##
==========================================
+ Coverage   88.50%   88.53%   +0.03%     
==========================================
  Files         295      295              
  Lines       40015    40046      +31     
==========================================
+ Hits        35415    35456      +41     
+ Misses       4600     4590      -10     

Impacted Files	Coverage Δ
ietf/doc/expire.py	95.31% <ø> (ø)
ietf/doc/views_ballot.py	92.86% <ø> (ø)
ietf/idindex/index.py	95.05% <ø> (ø)
ietf/ietfauth/utils.py	92.85% <ø> (ø)
ietf/ipr/utils.py	53.96% <0.00%> (ø)
ietf/review/models.py	91.91% <ø> (ø)
ietf/stats/views.py	93.10% <ø> (ø)
ietf/utils/draft.py	71.75% <0.00%> (ø)
ietf/doc/views_draft.py	91.94% <25.00%> (ø)
ietf/submit/forms.py	82.74% <37.50%> (ø)
... and 30 more

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