fix pubsub redis close bug

[Taction]

Description

Redis component close function called r.client.Close() .
The pollNewMessagesLoop loop run in a goroutine use client to read from redis which will lead to an error: error retrieving pending Redis messages: redis: client is closed.
When err occured this loop will continue. The context closed check will never have chance to run.

if err != nil {
	r.logger.Errorf("redis streams: error reading from stream %s: %s", stream, err)
	continue
}
// below will have no chance to run if client is closed

We need move the check to the top of this loop.

Issue reference

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]

[codecov]

Codecov Report

Merging #769 (100e41c) into master (1924618) will increase coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
+ Coverage   32.97%   33.02%   +0.04%     
==========================================
  Files          96       96              
  Lines        8549     8549              
==========================================
+ Hits         2819     2823       +4     
+ Misses       5473     5467       -6     
- Partials      257      259       +2     

Impacted Files	Coverage Δ
pubsub/redis/redis.go	22.40% <0.00%> (ø)
state/cloudstate/cloudstate_crdt.go	10.37% <0.00%> (+1.65%)	⬆️

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[pkedy]

Yep! Totally makes sense!