Remove unused name_or_id query param on bgp announce set list

[david-crespo]

Closes #6467

Happy to throw this out @internet-diglett if it conflicts with anything you're doing, but it's small enough that I think you might be able to just merge it into yours.

[internet-diglett]

Probably makes sense to update the name_or_id to announce_set while we're here:

omicron/nexus/external-api/src/lib.rs

Lines 1572 to 1593 in 5fab4be

	#[endpoint {
	method = DELETE,
	path = "/v1/system/networking/bgp-announce-set/{name_or_id}",
	tags = ["system/networking"],
	}]
	async fn networking_bgp_announce_set_delete(
	rqctx: RequestContext<Self::Context>,
	path_params: Path<params::BgpAnnounceSetSelector>,
	) -> Result<HttpResponseUpdatedNoContent, HttpError>;
	// TODO: is pagination necessary here? How large do we expect the list of
	// announcements to become in real usage?
	/// Get originated routes for a specified BGP announce set
	#[endpoint {
	method = GET,
	path = "/v1/system/networking/bgp-announce-set/{name_or_id}/announcement",
	tags = ["system/networking"],
	}]
	async fn networking_bgp_announcement_list(
	rqctx: RequestContext<Self::Context>,
	path_params: Path<params::BgpAnnounceSetSelector>,
	) -> Result<HttpResponseOk<Vec<BgpAnnouncement>>, HttpError>;

[internet-diglett]

Left a small suggestion since we're in here. Tested this in a4x2 and everything appears to work as intended.