feat(openStackblitz): about modal and export Modal

[anamikaanu96]

Closes #7175

Implemented open stackblitz in About Modal and Export Modal

What did you change?

Created
packages/ibm-products/src/components/AboutModal/AboutModal.mdx and
packages/ibm-products/src/components/ExportModal/ExportModal.mdx

Updated
packages/ibm-products/src/components/AboutModal/AboutModal.stories.jsx
packages/ibm-products/src/components/ExportModal/ExportModal.stories.jsx
e2e/components/AboutModal/AboutModal-test.avt.e2e.js

How did you test and verify your work? yarn storybook and open stackblitz (Without the changes to codePreviewer.tsx from 7365, this PR cannot be tested in the deployment preview.)

Note: This PR should only be merged after 7365
Therefore, marking it as a draft until 7365 is merged.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.48%. Comparing base (910b7ed) to head (7a41a4d).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7479      +/-   ##
==========================================
+ Coverage   84.45%   84.48%   +0.03%     
==========================================
  Files         425      425              
  Lines       17235    17247      +12     
  Branches     4564     4575      +11     
==========================================
+ Hits        14555    14571      +16     
+ Misses       2680     2676       -4     

Components	Coverage Δ
ibm-products	82.05% <ø> (+0.04%)	⬆️
ibm-products-web-components	92.14% <ø> (ø)

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[matthewgallo]

Just a few things, we've lost the "usage guidelines" link at the top of the docs page for both.

Also, for the product logos in about modal, lets use either all hosted urls or all base64 encoded images.

[anamikaanu96]

Hey @sangeethababu9223 and @matthewgallo, Thanks for reviewing! Done the changes!

For the product logos, it seems that Webpack is converting the images to either Base64 or hosted URLs based on their file size. I got these from the inspect window. In the case of Grafana and Ansible logo's, their sizes exceed 70KB, which is likely why they are being served as hosted URLs instead of being inlined as Base64.

If we want the images to be either hosted URLs or Base64, we could consider working with a designer to optimize and reduce the file sizes. Please suggest if you have any idea.