Only limit height of console widget

[PhilippHomann]

PR #10147 changed the layout of the build page.
Unfortunately the height of the Summary is limited to 300px after that commit and there is no scrollbar shown for summaries higher than that.
This commit just limits the height property to the console widget.
Alternatively a overflow: scroll could be added.
Maybe @janfaracik might leave a comment on whats more desired.

Testing done

Proposed changelog entries

• Fix limitation of summary widget on build page

Proposed changelog category

/label regression-fix, web-ui

Proposed upgrade guidelines

N/A

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Desired reviewers

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[comment-ops-bot]

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[comment-ops-bot]

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Check that the label exists and is spelt right then try again.