Disable certain properties when not needed

[XiaoMigros]

This PR disables the Text Offset option for text in line elements when there is no text to be offset. Additionally, the 'Gap between text and line' option is disabled when there is no text to leave a gap between.

• I signed the CLA
• The title of the PR describes the problem it addresses
• Each commit's message describes its purpose and effects, and references the issue it resolves
• If changes are extensive, there is a sequence of easily reviewable commits
• The code in the PR follows the coding rules
• There are no unnecessary changes
• The code compiles and runs on my machine, preferably after each commit individually
• I created a unit test or vtest to verify the changes I made (if applicable)

[zacjansheski]

Tested on MacOS 14, Windows 11, Ubuntu 22.04.3. Approved

[cbjeukendrup]

Now that #22602 has been merged:

Suggested change

	m_gapBetweenTextAndLine->setIsEnabled(isLineAvailable && (hasBeginText || hasContinueText));
	m_gapBetweenTextAndLine->setIsEnabled(isLineAvailable && (hasBeginText || hasContinueText || hasEndText));

[XiaoMigros]

Should that component visually be moved as well, maybe to the top or bottom of the text section? Up until now it made sense to keep it between begin and continue text because it only affected them, but now it affects all text types...

[cbjeukendrup]

I had forwarded the question above to @bkunda on Slack, but unless I missed something I hadn't heard back yet. I think it's indeed good to move this property but the question is of course where.