set resource and requests limits for pulllsubscription receiver adapter

[capri-xiyue]

Fixes #1105

Proposed Changes

-🧽 set resource and requests limits for pulllsubscription receiver adapter

Release Note

Adjusted pullsubscription receiver adapter cpu and memory requests and limits with
cpu request:500m, 
cpu limit: 600m, 
memory request:50mi, 
memory limit:600mi.
It should work with 1000 tps.

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: capri-xiyue

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[capri-xiyue]

FYI: #1105 (comment)

[capri-xiyue]

/retest

[capri-xiyue]

Updated number based on this sheet #1105 (comment) @nachocano

[capri-xiyue]

/retest

[capri-xiyue]

/test pull-google-knative-gcp-unit-tests

[nachocano]

/lgtm

Thanks @capri-xiyue !!!

[knative-test-reporter-robot]

The following jobs failed:

Test name	Triggers	Retries
pull-google-knative-gcp-integration-tests	pull-google-knative-gcp-integration-tests pull-google-knative-gcp-integration-tests	2/3
pull-google-knative-gcp-wi-tests	pull-google-knative-gcp-wi-tests pull-google-knative-gcp-wi-tests	2/3

Automatically retrying due to test flakiness...
/test pull-google-knative-gcp-integration-tests