Fix new pylint version 4.0.4 errors in exporter

[rads-1996]

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[Copilot]

Pull request overview

This pull request addresses pylint 4.0.4 compatibility issues across the azure-monitor-opentelemetry-exporter package. The changes are purely maintenance-focused to resolve new linting errors introduced in pylint version 4.0.4.

Changes:

• Added appropriate pylint disable comments for valid suppressions (name-too-long, unused-argument, protected-access, etc.)
• Fixed mutable default arguments (e.g., headers={} changed to headers=None)
• Added missing self parameters to class methods
• Prefixed unused variables with underscore
• Reformatted long lines and strings to comply with line length limits
• Reordered imports to follow proper conventions

Reviewed changes

Copilot reviewed 76 out of 76 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test files (tests/*)	Added pylint disable comments for test-specific patterns like name-too-long, too-many-public-methods, protected-access, and prefixed unused mock parameters with underscore
test_base_exporter.py	Fixed mutable default argument in MockResponse.init and added missing self parameter to mock class methods
test_storage.py	Uncommented assertion that was previously disabled, fixed isinstance checks, and added broad-exception-caught disables
sample files (samples/*)	Reordered imports to follow proper conventions and added pylint disable comments for sample-specific patterns
statsbeat/_utils.py	Added do-not-log-exceptions-if-not-debug disables for warning logs with exceptions
export/_base.py	Added do-not-log-exceptions-if-not-debug and do-not-use-logging-exception disables, plus unidiomatic-typecheck for valid type(None) check
_quickpulse/_exporter.py	Added do-not-log-exceptions-if-not-debug disables for exception logging
_performance_counters/_manager.py	Added do-not-use-logging-exception disables for logger.exception calls
_configuration/*.py	Added do-not-log-exceptions-if-not-debug disables for exception warning logs