Update upgrade docs with license key info

[rmloveland]

Fixes DOC-11693

[github-actions[bot]]

Files changed:

• src/current/_includes/common/upgrade-cockroach-version-license-limitations.md
• src/current/v24.3/upgrade-cockroach-version.md

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[rmloveland]

@jaiayu i've tried to make this a self-contained part of the set of pre-upgrade steps

please take a look and let me know what you think!

the use of a common include is to facilitate backporting this update to v23.1, v23.2, v24.1, v24.2 as fast-follows from this PR

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