minecraft:rideable - removing unused properties in vanilla files

Partner Rank: 4
Partner Team Reporting: Blockception
Verification builds: 1.17.40

Summary:

`minecraft:rideable` has been defined with a property `priority` but isn't actually doing anything and has been documentated as not working, suggested to remove it for consistency

Impact:

• Good examples for the community to use.
• Correct working vanilla data-driven files.

Repro Steps:

Observed Results:

Expected Results:

Correct, consistent vanilla files that not only follows minecraft readable format but also by written convention/documentation.

Screenshots/Videos attached: No

Regression Builds: N/A

Notes:

Files:

• behaviorpack/entities/strider.json