Revert "Release/976.0.0 (#8768)"

[maxime-oe]

This reverts commit 639fc11.

Explanation

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Low risk: this PR mainly reverts package version numbers and dependency bumps, with no functional code changes; risk is limited to release/versioning consistency across packages.

Overview
Reverts the prior 976.0.0 release version bumps across the monorepo, rolling back workspace/package versions for @metamask/assets-controller, @metamask/assets-controllers, @metamask/bridge-controller, @metamask/bridge-status-controller, and @metamask/transaction-pay-controller, along with their internal dependency ranges.

Updates associated CHANGELOG.md files by removing the newly introduced release sections and adjusting the Unreleased compare links to point back to the previous released versions, and updates yarn.lock to match the reverted dependency versions.

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