CI: Coverage: Fix: Change the source of component name.

[gbarkadiusz]

Getting Component Name from Testsuite Name Instead of Testcase Identifier

This pr modifies the way the component name is derived for coverage report generation. Previously, the script extracted the component name from the testcase identifier, assuming it followed the format:

[component.subcomponent]

However, after commit 9219c81 (twister: make no-detailed-test-id default), the level of detail in test identifiers was reduced.

9219c81b66f48523f0cd3b7b7cac8cf3dadb84b2 is the first bad commit
commit 9219c81b66f48523f0cd3b7b7cac8cf3dadb84b2
Author: Anas Nashif <anas.nashif@intel.com>
Date:   Fri Jul 11 11:36:03 2025 -0400

    twister: make no-detailed-test-id default

    Make this option default and reduce amount of details displayed by
    twister.
    This options has been enabled in CI for a while now with the intention
    of making it default.

    Signed-off-by: Anas Nashif <anas.nashif@intel.com>

 .github/workflows/clang.yaml                    | 2 +-
 .github/workflows/twister.yaml                  | 6 +++---
 .github/workflows/twister_tests_blackbox.yml    | 8 ++++----
 scripts/ci/test_plan.py                         | 4 ++--
 scripts/pylib/twister/twisterlib/environment.py | 4 ++--
 scripts/tests/twister/conftest.py               | 1 +
 6 files changed, 13 insertions(+), 12 deletions(-)
root@acholewx-mobl:~/develop/repos/zephyr_upstream#

Example change in identifiers:

Before (detailed):

"identifier": "bluetooth.audio.cap_commander.test_default.cap_commander_test_broadcast_reception.commander_reception_stop_inval_no_subgroups"

After (reduced):

"identifier": "cap_commander_test_broadcast_reception.commander_reception_stop_inval_no_subgroups"

Because of this, the script incorrectly interprets cap_commander_test_broadcast_reception as the component name instead of the correct bluetooth. This leads to the following issue when generating the coverage report:

xlsxwriter.exceptions.InvalidWorksheetName: Excel worksheet name 'cap_commander_test_broadcast_reception' must be <= 31 chars.

(Example failure: GitHub Actions log)

This change updates the logic to derive the component name from the testsuite name rather than testcase identifier, restoring correct component mapping and preventing coverage report generation failures.

Probe run:
https://github.com/zephyrproject-rtos/zephyr/actions/runs/16442311600?pr=93496

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud