Social: Default to the current post ID for share status

[manzoorwanijk]

In #39073, we created the getPostShareStatus selector which requires the post ID. In most of the cases for share status, we will be dealing with the current post ID. So, it's better to default to the current post ID to avoid too much boilerplate to get the post ID

Proposed changes:

*Default to the current post ID for share status selector

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• Same as Social: Add share status info #39073

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the update/social-default-to-the-current-post-id-for-share-status branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack update/social-default-to-the-current-post-id-for-share-status
  

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• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

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[spsiddarthan]

LGTM