ci: merge mock + init job in nightly

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Merges the two together as one step as it doesn't really make sense to separate the two.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.65%. Comparing base (6c42770) to head (34cc390).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1584       +/-   ##
===========================================
- Coverage   54.22%   41.65%   -12.57%     
===========================================
  Files         114      114               
  Lines       17893    17893               
===========================================
- Hits         9702     7453     -2249     
- Misses       8191    10440     +2249     

Flag	Coverage Δ
macos-12	36.94% <ø> (ø)
ubuntu-latest	43.38% <ø> (-13.23%)	⬇️
windows-2019	36.87% <ø> (ø)

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