Temporarily remove OneSettings configuration manager to prevent user disruptions during feature testing

[rads-1996]

Description

Temporarily remove OneSettings configuration manager to prevent user disruptions during feature testing

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

[Copilot]

Pull request overview

This PR temporarily removes the OneSettings configuration manager initialization from the base exporter to prevent user disruptions during feature testing. The change removes the configuration manager setup from the exporter's initialization process while preserving the functionality for other parts of the codebase that still depend on it (like live metrics and statsbeat). This is a non-breaking internal change that affects how the exporter initializes but doesn't impact the public API.

• Removed OneSettings configuration manager initialization from BaseExporter
• Cleaned up unused imports related to configuration manager utilities
• Updated CHANGELOG with appropriate entry under "Other Changes"

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/_base.py	Removed configuration manager initialization and related imports from BaseExporter.init()
sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md	Added entry documenting the temporary removal of OneSettings configuration manager

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[JacksonWeber]

What kind of disruptions was this causing prior? Just want to understand the scope of the change here.

[rads-1996]

What kind of disruptions was this causing prior? Just want to understand the scope of the change here.

The users were getting warnings about version mismatch, and the warnings were very frequent and causing unnecessary amounts of traces.