Remove unexpected default vim mappings

[bringhurst]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• [X] The toolchain has been rebuilt successfully (or no changes were made to it)
• [X] The toolchain/worker package manifests are up-to-date
• [] Any updated packages successfully build (or no packages were changed)
• [X] Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• [ ] Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• [X] All package sources are available
• [X cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• [X] LICENSE-MAP files are up-to-date (./SPECS/LICENSES-AND-NOTICES/data/licenses.json, ./SPECS/LICENSES-AND-NOTICES/LICENSES-MAP.md, ./SPECS/LICENSES-AND-NOTICES/LICENSE-EXCEPTIONS.PHOTON)
• [X] All source files have up-to-date hashes in the *.signatures.json files
• [ ] sudo make go-tidy-all and sudo make go-test-coverage pass
• [ ] Documentation has been updated to match any changes to the build system
• [ ] If you are adding/removing a .spec file that has multiple-versions supported, please add @microsoft/cbl-mariner-multi-package-reviewers team as reviewer (Eg. golang has 2 versions 1.18, 1.21+)
• [ ] Ready to merge

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Summary

This PR removes the default vim key mapping overrides in /etc/vimrc. The current mappings create unexpected behavior (for example, vim will exit if you press the ESC key).

Change Log

• Remove default vim mapping overrides.

Does this affect the toolchain?

NO

Test Methodology

• Pipeline build id: TBD, a maintainer needs to allow CI to run on this PR.

[bringhurst]

Closing this. It appears to be a dupe of https://github.com/microsoft/azurelinux/pull/8504