Only lookup local post when quering with "wp_jp_foreign_id"

[crazytonyli]

Description

The wp_jp_foreign_id is introduced to associate local posts with posts in the WordPress site. In that process, we should only look up local posts. This PR adds a condition to only query local posts.

wp_jp_foreign_id is asavednot a unique id. Multiple posts may have the same "foreign id". I'm not exactly sure how to do that, but I think it's possible that some plugins have a feature to copy/duplicate a post which copies the post's custom fields too.

Testing instructions

Verify no regression on this issue: pe7hp4-N2-p2#comment-322

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 26.0. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by 🚫 Danger

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	27836
	Version	PR #24586
	Bundle ID	org.wordpress.alpha
	Commit	2253665
	Installation URL	76pe84smgoo78

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	27836
	Version	PR #24586
	Bundle ID	com.jetpack.alpha
	Commit	2253665
	Installation URL	4ek0fmerfdq18

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.