Hard-deprecate Sanitizer::escapeId()

Deprecated in MW 1.30; time to clean up any remaining uses.

Code search:
https://codesearch.wmflabs.org/deployed/?q=escapeId%5C%28&i=nope&files=&repos=

Depends-On: Ic03a5da2e1d6b8f5656555420dd573a1d698b9cc
Depends-On: I311f44a5035f73c0fb2289f727eb39b73007429b
Depends-On: I76c5b539bae5572c4ac65f28fec9c0c36381348c
Depends-On: Id4cbfc3b113b1b04f949d485187e89ffe0b487f5
Depends-On: I7d5ba4930688ed7f011a4babed5986b8e40910a0
Depends-On: I964f83ce88fb9c66a7c59037c6066f4567bcf4c9
Change-Id: I89504cfdf8e02831d54a26900bfdc63a33b4eade

includes/parser/Sanitizer.php

@@ -1221,6 +1221,7 @@ class Sanitizer {
 	 * @return string
 	 */
 	static function escapeId( $id, $options = [] ) {
+		wfDeprecated( __METHOD__, '1.30' );
 		$options = (array)$options;
 
 		// HTML4-style escaping

tests/phpunit/unit/includes/parser/SanitizerUnitTest.php

@@ -205,6 +205,7 @@ class SanitizerUnitTest extends MediaWikiUnitTestCase {
 	 * @covers Sanitizer::escapeId
 	 */
 	public function testEscapeId( $input, $output ) {
+		$this->hideDeprecated( 'Sanitizer::escapeId' );
 		$this->assertSame(
 			$output,
 			Sanitizer::escapeId( $input, [ 'noninitial', 'legacy' ] )