Better naming for prefetchCount env var

[gabo1208]

Changes

• 🧹 Changed prefetchCount env variable name to Parallelism in both Trigger and Source, to better reflect its functionallity
• 🧹 Updated tests, samples and docs accordingly

/kind enhancement

Fixes #615

Release Note

🧹 Changed prefetchCount env variable name to Parallelism in both Trigger and Source, to better reflect its functionallity

[codecov]

Codecov Report

Merging #676 (657815a) into main (a93b956) will increase coverage by 0.25%.
The diff coverage is 66.33%.

@@            Coverage Diff             @@
##             main     #676      +/-   ##
==========================================
+ Coverage   75.08%   75.34%   +0.25%     
==========================================
  Files          47       44       -3     
  Lines        2910     2900      -10     
==========================================
  Hits         2185     2185              
+ Misses        585      578       -7     
+ Partials      140      137       -3     

Impacted Files	Coverage Δ
pkg/apis/sources/v1alpha1/rabbitmq_defaults.go	0.00% <0.00%> (ø)
pkg/apis/sources/v1alpha1/rabbitmq_types.go	50.00% <ø> (ø)
pkg/rabbit/service.go	0.00% <0.00%> (ø)
pkg/reconciler/trigger/trigger.go	59.40% <44.68%> (-0.83%)	⬇️
pkg/adapter/adapter.go	61.18% <62.50%> (-5.81%)	⬇️
pkg/apis/sources/v1alpha1/rabbitmq_validation.go	61.90% <66.66%> (ø)
pkg/apis/eventing/v1/trigger_validation.go	71.87% <100.00%> (ø)
pkg/rabbitmqnaming/naming.go	100.00% <100.00%> (ø)
pkg/reconciler/broker/broker.go	89.67% <100.00%> (+0.28%)	⬆️
pkg/reconciler/broker/broker_config.go	74.60% <100.00%> (+0.83%)	⬆️
... and 17 more

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[ChunyiLyu]

LGTM

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChunyiLyu, gabo1208

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