Remove $CMSIS_BUILD_ROOT references and test structure cleanup

[soumeh01]

Addressing issue : #73

[github-actions]

Test Results

    4 files  ±0    36 suites  +4   3s ⏱️ -3s
133 tests  - 2  133 ✔️  - 2  0 💤 ±0  0 ❌ ±0 
532 runs   - 8  532 ✔️  - 8  0 💤 ±0  0 ❌ ±0 

Results for commit 27e510a. ± Comparison against base commit 851a530.

This pull request removes 4 and adds 2 tests. Note that renamed tests count towards both.

cbuild/pkg/builder/cproject ‑ TestGetInternalVars/test_get_internal_vars,_with_CMSIS_BUILD_ROOT
cbuild/pkg/builder/cproject ‑ TestGetInternalVars/test_get_internal_vars,_without_CMSIS_BUILD_ROOT
cbuild/pkg/utils ‑ TestGetInstallConfigs/test_get_install_configs_with_CMSIS_BUILD_ROOT
cbuild/pkg/utils ‑ TestGetInstallConfigs/test_get_install_configurations_without_CMSIS_BUILD_ROOT

cbuild/pkg/builder/cproject ‑ TestGetInternalVars/test_get_internal_vars
cbuild/pkg/utils ‑ TestGetInstallConfigs/test_get_install_configurations

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -4.28% ⚠️

Comparison is base (851a530) 77.14% compared to head (27e510a) 72.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   77.14%   72.86%   -4.28%     
==========================================
  Files          13       13              
  Lines        1028     1021       -7     
==========================================
- Hits          793      744      -49     
- Misses        185      232      +47     
+ Partials       50       45       -5     

Files Changed	Coverage Δ
pkg/utils/configs.go	50.00% <33.33%> (-25.00%)	⬇️
pkg/utils/utils.go	81.56% <100.00%> (-0.64%)	⬇️

... and 4 files with indirect coverage changes

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[jkrech]

LGTM