[resiliency]: Fix ValueError if /etc/xensource-inventory has lines without =

[bernhardkaindl]

xen-bugtool/readKeyValueFile(): Remove unused code and simplify the remaining code

• xen-bugtool/readKeyValueFile(): Use contextmanager for open/close

[Copilot]

Pull Request Overview

This PR simplifies the readKeyValueFile() function in xen-bugtool by removing unused parameters and dead code while improving resource management. The changes also update GitHub workflow configuration and codecov settings.

• Removes unused allowed_keys and strip_quotes parameters from readKeyValueFile()
• Replaces manual file handling with context manager for proper resource management
• Updates SonarCloud action and codecov configuration

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
xen-bugtool	Simplifies readKeyValueFile() function by removing unused parameters and using context manager
.github/workflows/main.yml	Updates SonarCloud action to SonarQube scan action with error handling
.codecov.yml	Updates codecov configuration comments and removed_code_behavior setting

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