fix: Adjust docs build steps in makefile to fix building all versions

[coldice]

Description

Fixes the docs build process: re-enable building multiple versions. This should make the version selection work again:

Closes: #10228

Adjust Makefile: The issue was caused by changes on the local file system during build, which prevents the git checkout command from succeeding. These can be caused by:

• A changed mod.sum file
• Artifacts left over from building the previous version

This PR adjusts the makefile to ignore existing changes (git clean & git reset). The overall build process is not changed.
Please note: The actual build & deployment is triggered from the cosmos docs repository. The check-docs action in this repository only checks building the updated branch's docs.

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules (not applicable)
• included the necessary unit and integration tests (not applicable)
• added a changelog entry to CHANGELOG.md (not applicable)
• included comments for documenting Go code (not applicable)
• updated the relevant documentation or specification (not applicable)
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[alexanderbez]

utACK

[tac0turtle]

utACK, gonna merge and it should be deployed shortly