Move .coveragerc contents to pyproject.toml

[mhucka]

Consolidate tool settings into pyproject.toml.

One of the PRs that will resolve #1268.

[mhucka]

/gemini review

[gemini-code-assist]

Code Review

This pull request migrates the coverage configuration from a standalone file to pyproject.toml and updates the pytest-and-incremental-coverage script to reflect this change. A critical issue was identified in pyproject.toml where the [tool.coverage.run] table header is duplicated, which would result in a TOML parsing error.

[gemini-code-assist]

Code Review

This pull request migrates the coverage configuration from a standalone .coveragerc file to pyproject.toml. It updates the pytest-and-incremental-coverage script to remove the explicit configuration path and adds the corresponding omit rules to the pyproject.toml file. I have no feedback to provide as there were no review comments.