[charts] Change x-axis height based on label presence

[JCQuintas]

Adjust the default x-axis height to dynamically change depending on whether an axis label is present. Reference: https://mui-org.slack.com/archives/C02EQ97NV8F/p1761036771682109? thread_ts=1761035421. 768029&cid=C02EQ97NV8F

This will help improve layout adaptability, especially when axis labels differ per chart instance.

Parent issue: #17955

[JCQuintas]

Will be fixed in #21087

[github-actions]

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[github-actions]

This issue has been closed. If you have a similar problem but not exactly the same, please open a new issue.
Now, if you have additional information related to this issue or things that could help future readers, feel free to leave a comment.