Add content logging to help debug a Story post crash

[renanferrari]

This PR is a follow up to #14185 and helps to investigate #13697.

It basically adds a SiteModel parameter to the findAllStoryBlocksInPostAndPerformOnEachMediaFilesJson method which we then use to check if we should also log the Post's content in addition to reporting any caught StringIndexOutOfBoundsException. The logic used to determine that is based on this one, which makes sure we only log posts that are not private or password-protected, on WPCom sites that are also not private.

To test:

Again, there's not much to test here since we can't reproduce the issue, but you can smoke test the Story feature and make sure nothing looks off.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APK here.

[mzorz]

Thank you for these changes @renanferrari 💯

I was able to test the try/catch path by adding an artificial throw StringIndexOutOfBoundsException("TEST") line within the try{} block, and confirmed the logcat showed what I expected:

2021-03-04 18:17:21.062 15273-15273/org.wordpress.android E/WordPress-EDITOR: Error while parsing Story blocks: TEST
2021-03-04 18:17:24.027 15273-15333/org.wordpress.android D/Volley: [534] BasicNetwork.logSlowRequests: HTTP response for request=<[ ] https://public-api.wordpress.com/wpcom/v2/sites/176139122/rewind/capabilities/?_locale=en_US 0x7b2dc254 NORMAL 39> [lifetime=20476], [size=19], [rc=200], [retryCount=0]
2021-03-04 18:17:29.517 15273-15273/org.wordpress.android E/WordPress-EDITOR: HTML content of the post before the crash: <!-- wp:jetpack/story {"mediaFiles":[{"alt":"asdfafdafa","caption":"","id":"1","link":"","mime":"image/jpeg","type":"image","url":""}]} -->
    <div class="wp-story wp-block-jetpack-story"></div>
    <!-- /wp:jetpack/story -->

Also confirmed the test case runs correctly
Finally, I gave a pass on the code which looks right and to the point 👍

LGTM