Fixes angular duplicated navbar element generation.

[mshima]

Allows to customize already applied needled detection.

• prettierAware: prettier formatting takes line width into account.
  Needles must test for dynamic empty space/line breaks count.
• regexp: custom detection when testing the entire content is not a good approach, and there is a simpler test to use.

Related to #14388.

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[mshima]

Switched to use routerLink to check for existing needles, doesn't make sense to have 2 identical routerLink.
Otherwise we can create an id.