fix: APPS-2947 Update NavBreadcrumb logic to display route title or prop title

[tinuola]

Connected to APPS-2947

Component Updated: NavBreadcrumb.vue

Stories Updated: ~/stories/NavBreadcrumb.stories.js

Notes:

• Refactored code and template logic to enable:
  • using routes with and without trailing forward slash (/)
  • setting final breadcrumb with title prop when route is present
• Created / refactored stories to reflect:
  • routes with and without trailing forward slash
  • breadcrumbs from route and a title prop

Screenshots: Breadcrumb title from prop

Breadcrumb title from route

Checklist:

• [x] I checked that it is working locally in the dev server
• [x] I checked that it is working locally in the storybook
• [x] I checked that it is working locally in the library-website-nuxt dev server
• [x] I added a screenshot of it working
• [ ] UX has reviewed and approved this
• [x] I assigned this PR to someone on the dev team to review
• [x] I used a conventional commit message
• [x] I assigned myself to this PR

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[github-actions[bot]]

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[pghorpade]

:tada: This PR is included in version 3.21.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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