Queue Services (emailer and DBC): Add pytest ini with addopts for code cov GHA fix

[loneil]

Issue #: N/A

Description of changes:
Noticed while looking at PRs the queue services

• business-digital-credentials
• business-emailer

were failing a step because code coverage Action wasn't able to get a coverage file. This is because the pytest step in the workflow just runs

ARGS="--cov-report=term --cov-report=xml"
CMD="poetry run pytest"    # (or uv/plain pytest based on tool detection)

so it's up to the individual services to actually supply the --cov arg. Added it for these 2 with pytest ini in pyproject (same as all the others do)

Didn't bump version number since it doesn't actually affect distribution artifacts, just pytest.

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[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

[Copilot]

Pull request overview

This PR centralises the --cov=src pytest flag into the [tool.pytest.ini_options] section of each service's pyproject.toml, so that coverage is enabled automatically for all pytest invocations (including in GitHub Actions). This is intended to fix a code-coverage issue in the GHA workflow. The business-digital-credentials Makefile test target is updated to remove the now-redundant --cov=src CLI flag.

Changes:

• Added [tool.pytest.ini_options] with addopts = "--cov=src" to business-emailer/pyproject.toml and business-digital-credentials/pyproject.toml.
• Updated business-digital-credentials/Makefile test target to remove the CLI-level --cov=src (and --cov-report=term) flags, now handled by addopts.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
queue_services/business-emailer/pyproject.toml	Adds [tool.pytest.ini_options] section with addopts = "--cov=src"
queue_services/business-digital-credentials/pyproject.toml	Adds [tool.pytest.ini_options] section with addopts = "--cov=src"
queue_services/business-digital-credentials/Makefile	Removes the now-redundant --cov=src (and --cov-report=term) flags from the test target

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[loneil]

Emailer is still failing the step because it's below 80% coverage, but the coverage is actually working now, so can shore up unit tests on that later.