fix: replace hardcoded edX with platformName in basicBannerTitle message

[Anas12091101]

Description

This PR replaces the hardcoded "edX" with platformName in the basicBannerTitle message.

Useful information to include:

• Which user roles will this change impact? Course Author
• Include screenshots for changes to the UI (ideally, both "before" and "after" screenshots, if applicable).

Supporting information

https://github.com/mitodl/hq/issues/9362

Testing instructions

• Add the following settings to your edx-platform instance to display the banner:

MKTG_URLS = {
    "ROOT": "https://your-marketing-site-url"
}
FEATURES["ENABLE_MKTG_SITE"] = True

• Verify that the basicbannerTItle reflects the platform name instead of edX on the Scheduling & Details page

Other information

Include anything else that will help reviewers and consumers understand the change.

• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, security, or accessibility.

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

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• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @Anas12091101!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.86%. Comparing base (0c1554b) to head (88e2ec1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2711    +/-   ##
========================================
  Coverage   94.86%   94.86%            
========================================
  Files        1233     1233            
  Lines       27940    27940            
  Branches     6337     6150   -187     
========================================
  Hits        26505    26505            
- Misses       1364     1377    +13     
+ Partials       71       58    -13     

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[bradenmacdonald]

Testing instructions

• Verify that the basicbannerTItle reflects the platform name instead of edX on the Scheduling & Details page

How do I get the banner to appear? I don't see it on a normal course's "Schedule & Details" page.

[Anas12091101]

I'm sorry for the oversight. I should have included this in the testing instructions. Please add the following settings to your edx-platform instance to display the banner:

MKTG_URLS = {
    "ROOT": "https://your-marketing-site-url"
}
FEATURES["ENABLE_MKTG_SITE"] = True

[bradenmacdonald]

Thanks, LGTM.