Update CI pipeline and bump supported ns-3 version to ns-3.43

[non-det-alle]

Ns-3.43 introduces the following changes to the CI pipeline:

• Remove explicit CodeQL job and rely on automatic GitHub scans
• Update doxygen version used for generating docs, as well as clang-tidy and format versions

The following maintenance changes to this repo's CI are also applied:

• Remove repo actions that do not remove CI code duplication
• Align workflow naming scheme, minor fixes on comments and printing
• Codecov: Code compilation mode to default, and official GitHub action in place of deprecated script

Notable changes to module files brought by ns-3.43:

• All GPL licence text in files becomes SPDX licence

Ns-3.43 also removes dependency of the propagation module's tests on the applications module. In the past, the lowest compilation time could only be achieved via --enable-modules "lorawan;applications", as we did in our CI jobs. Now configuring ns-3 with just --enable-modules lorawan still leads to all tests passing but with a lower compilation time. Yay! See this ns-3 issue for more details.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.68%. Comparing base (e99f688) to head (7d5b4f0).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
model/class-a-end-device-lorawan-mac.cc	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #173      +/-   ##
===========================================
+ Coverage    76.25%   77.68%   +1.43%     
===========================================
  Files           69       66       -3     
  Lines         5436     6844    +1408     
===========================================
+ Hits          4145     5317    +1172     
- Misses        1291     1527     +236     

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[non-det-alle]

Note: The decrease in test coverage signaled by Codecov is expected, as now we run coverage checks with the default build mode instead of release, thus also including logs as part of the code built and tested. This should be automatically fixed by future commits.

[non-det-alle]

Fixed Codecov CI error by extending test coverage to buildings model via an example's parameter in tests