feat: remove cta and hide notifications banner if no accounts url

[asadali145]

Description:

CTA was added 2 years back. It is enabled by default and notification is visible all the time. This PR removes the CTA. If we still need CTA, we can put it behind a flag.

This PR also conditionally displays the notifications banner. Previously, If ACCOUNT_SETTINGS_URL was not set, it redirected to a 404 <lms_base_url>/notifications.

Screen Shots:

Before:

After:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8809f4c) to head (056f661).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #347   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          111       109    -2     
  Lines         1082      1079    -3     
  Branches       160       161    +1     
=========================================
- Hits          1082      1079    -3     

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[asadali145]

@jansenk Would you be able to review this PR?

[asadali145]

@brian-smith-tcril Would you be able to review this PR?