MWPW-147876 Improve SharePoint editing

[Brandon32]

• Add browser context for headless runs, login once with headed.
• Fetch admin api instead of navigating to save time.
• Check that document loads successfully and output any errors.
• Navigate to first non-table section to be able to add page break, checks for page break.
• Soft fail if document doesn't save, undo edit step.
• Tuning timeouts: 1s for toPass loops, 30s for long tasks, 2 min timeout for each test. (Most pages finish in under 20s.)

Resolves: MWPW-147876

[JackySun9]

you need await for this

[JackySun9]

I mean for textContent()

[Brandon32]

ESLint will complain of redundant use of await on a return. (https://eslint.org/docs/rules/no-return-await)
I can change it to this:

Suggested change

	return this.dialogText.textContent();
	const dialogText = await this.dialogText.textContent();
	return dialogText;