Remove `MatrixClient.initLegacyCrypto` #10847

Job	Run time
JSDoc Checker	32s
ESLint	40s
Node.js example	43s
Typescript Syntax Check	30s
Workflow Lint	14s
Analyse Dead Code	20s
Downstream tsc element-web	0s
Downstream Typescript Syntax Check	1s
	3m 0s

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