Normalize `http.response.status_code` for Metrics & Alerts

[krystofwoldrich]

Problem Statement

• develop docs update: OTel Semantic convention develop#943
• team issue: Project: Normalize http.response.status_code for Metrics & Alerts team-sdks#9
• related mobile team issue (as this change affects RN): https://github.com/getsentry/team-mobile/issues/121

Solution Brainstorm

Related code:

sentry-javascript/packages/core/src/tracing/span.ts

Lines 228 to 235 in f361c81

	public setHttpStatus(httpStatus: number): this {
	this.setTag('http.status_code', String(httpStatus));
	const spanStatus = spanStatusfromHttpCode(httpStatus);
	if (spanStatus !== 'unknown_error') {
	this.setStatus(spanStatus);
	}
	return this;
	}

If the http.status_code tag is removed at the same time this could be a breaking change.