Fix optional properties dropped from generic base models

[utafrali]

Base model properties were getting dropped from the generated classes because concat() doesn't mutate in place. Switched to push() and added a test case to verify. Fixes #10400

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commit: 0f89f7f

[github-actions]

❌ There is undocummented changes. Run chronus add to add a changeset or click here.

The following packages have changes but are not documented.

• ❌@typespec/http-server-csharp

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[timotheeguerin]

Suggested change

	model Message<TData> {
	source: string;
	msgType: string;
	reference?: string;
	timestamp?: offsetDateTime;
	data: TData;
	}
	model Report {
	value: string;
	}
	model ReportMessage is Message<Report>;
	@route("/report") @get op getReport(): ReportMessage;
	model Template<T> {
	baseProp: T
	}
	model ReportMessage is Template<string>;
	op getReport(): ReportMessage;

to keep the test as relevant as possible

[utafrali]

Done, pushed the fix.