No Bug: Fix incorrect url bar focusing behaviour when opening blank tabs

[kylehickinson]

As of #6150 merging, the openBlankNewTab was fixed to actually focus the URL bar when passing in true for the attemptLocationFieldFocus argument. However it turns out that we call this method with true all throughout the app even though we don't want the URL bar to focus in most of these scenarios.

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()
• New or updated UI has been tested across:
  • Light & dark mode
  • Different size classes (iPhone, landscape, iPad)
  • Different dynamic type sizes

Test Plan:

• Verify opening via search widget indeed focuses the URL bar
• Verify opening blank new tabs in all other scenarios do not focus the URL bar

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).