fix trace disconnect

[butonic]

when analyzing trace informatien we disconnect the context in upload.go:

func (store OcisStore) CreateNodeForUpload(session *OcisSession, initAttrs node.Attributes) (*node.Node, error) {
	ctx, span := tracer.Start(session.Context(context.Background()), "CreateNodeForUpload")

this leads to the trace information for an upload not showing what is going on in CreateNodeForUpload:

What happens in these 280ms?

traces produced with cs3org/reva#4978

[butonic]

well we can find out by searching jaeger for CreateNodeForUpload:

[butonic]

file operations are just slow:

CheckLock 137ms
InitNewNode 81ms
SetXAttrsWithContext 166ms which is mostly Read and WriteFile
Persist 70ms

that adds up to 470ms

[butonic]

more details:

requests seem to be faster right now 🤔

[butonic]

ok, with a 6min loadtast running, the io oparations become much slower:

[butonic]

TODO weird long ReadNode requests:

[butonic]

next bunch of requests that are slow are tagging requests:

[butonic]

it seems graph invite requests are slow:

need te add graph to the trace to see what is going on...

[butonic]

fetching the group takes a long time: