buck2_execute: implement OSS upload_blob for local_only cache uploads

[thoughtpolice]

Forward-port of patch 4 in #477, providing a clear piece of missing functionality: in the event that stdout or stderr were more than 50KiB of output when caching local_only actions, then this dead path was taken, and so stdout/stderr would not be uploaded successfully in the cache.

[facebook-github-bot]

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[ahornby]

make it match internal RE signature:

Suggested change

	pub async fn upload_blob(
	pub async fn upload_blob_with_digest(
	&self,
	blob: Vec<u8>,
	digest: TDigest,
	metadata: RemoteExecutionMetadata,
	) -> anyhow::Result<TDigest> {
	let blob = InlinedBlobWithDigest{digest:digest.clone(), blob, ..Default::default()};
	self.upload(
	metadata,
	UploadRequest {
	inlined_blobs_with_digest: Some(vec![blob]),
	files_with_digest: None,
	directories: None,
	upload_only_missing: false,
	..Default::default()
	},
	)
	.await?;
	Ok(digest)
	}

[ahornby]

updated to match signature used for internal RE call

Suggested change

	pub async fn upload_blob(
	pub async fn upload_blob(
	&self,
	blob: InlinedBlobWithDigest,
	use_case: RemoteExecutorUseCase,
	) -> buck2_error::Result<TDigest> {
	with_error_handler(
	"upload_blob",
	self.get_session_id(),
	self.client()
	.upload_blob_with_digest(blob.blob, blob.digest, use_case.metadata(None))
	.await,
	)
	.await
	}

[ahornby]

@thoughtpolice, commented with some small changes to make the PR apply cleanly vs the internal RE implementation, please apply, rebase and re-push the PR.