Remove use of html option in Dialog when only used for newlines

[knolleary]

Description

The Dialog service allows content to be provided as either text or html. Use of the html option brings additional risk when including component names as that can lead to XSS vulnerabilities.

This PR does three things:

1. Allows the text content to include newlines - which are then automatically rendered properly in the dialog
2. Moves all uses of the html option over to text where that were purely done to have newlines in the content
3. Ensures the recently added canBeCanceled option is also available when using the dialog service rather than via the component directly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.02%. Comparing base (3d7af2a) to head (7deefe0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3979   +/-   ##
=======================================
  Coverage   79.02%   79.02%           
=======================================
  Files         282      282           
  Lines       12839    12839           
  Branches     2863     2863           
=======================================
  Hits        10146    10146           
  Misses       2693     2693           

Flag	Coverage Δ
backend	79.02% <ø> (ø)

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