Extra view permissions for secrets

[ddabble]

This PR depends on #636 and will automatically change base branch to dev once that PR has been merged.

Proposed changes

New features

• Added a button for delaying hiding secrets for 30 seconds, in the secret list (1b3ec9a5867d10b1762dd1c06365a8100fc71e41)
• Added an extra_view_permissions field to secrets (3261cdd4c226bf7a0386d5c80b45770fbc5fb06a)
  • This makes it possible to create secrets that not all MAKE members need to know
  • Examples can be passwords to Google workspace users that only exist for technical purposes, or credentials for the admin page of a physical router
  • This resolves #542

Areas to review closely

That the buttons in the secret list work as intended, and that the extra_view_permissions are properly enforced.

Checklist

(If any of the points are not relevant, mark them as checked)

• [x] Created tests that fail without the changes, if relevant/possible
• [x] Made sure that your code conforms to the code style guides and that any common code smells have been addressed
  • (It's not intended that you read through this whole document, but that you get yourself an overview over its contents, and that you keep it in mind while taking a second look at your code before opening a pull request)
• [x] Added sufficient documentation - e.g. as docstrings or in the README, if suitable
• [x] Added your changes to the "Unreleased" section of the changelog - mainly the changes that are of particular interest to users and/or developers, if any
• [x] Added a "Deployment notes" section above, if anything out of the ordinary should be done when deploying these changes to the server

[codecov[bot]]

Codecov Report

Merging #637 (bc18a4f) into dev (2826b57) will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #637      +/-   ##
==========================================
+ Coverage   87.28%   87.38%   +0.09%     
==========================================
  Files         135      135              
  Lines        5677     5714      +37     
==========================================
+ Hits         4955     4993      +38     
+ Misses        722      721       -1     

Impacted Files	Coverage Δ
src/internal/admin.py	100.00% <100.00%> (ø)
src/internal/forms.py	87.15% <100.00%> (ø)
src/internal/models.py	93.78% <100.00%> (+0.45%)	:arrow_up:
src/internal/views.py	90.76% <100.00%> (+0.87%)	:arrow_up:

[ddabble]

Merging without explicit approval from another member, as the Dev committee previously agreed to merge these changes and assume they're relatively bug-free, simply to get things done quicker.