Use apis.HTTP() instead of apis.ParseURL() in the codebase

[capri-xiyue]

Problem
In the codebase, we use apis.ParseURL() in a lot of places. As @aliok suggested, #3616 (comment), apis.HTTP() is more convenient. We can use apis.HTTP() instead of apis.ParseURL() in the codebase

Persona:
Which persona is this feature for?

Exit Criteria
Use apis.HTTP() instead of apis.ParseURL() in the codebase

Time Estimate (optional):
How many developer-days do you think this may take to resolve?

Additional context (optional)
Add any other context about the feature request here.

[capri-xiyue]

This is a good-first-issue

[pierDipi]

/good-first-issue

[knative-prow-robot]

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Details

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[vaikas]

Luckily not too many files ;)

pkg/apis/flows/v1/parallel_lifecycle_test.go
pkg/apis/flows/v1/sequence_lifecycle_test.go
pkg/apis/flows/v1beta1/parallel_lifecycle_test.go
pkg/apis/flows/v1beta1/sequence_lifecycle_test.go
pkg/apis/sources/v1alpha1/apiserver_conversion_test.go
pkg/apis/sources/v1alpha1/apiserver_lifecycle.go
pkg/apis/sources/v1alpha1/ping_conversion_test.go
pkg/apis/sources/v1alpha1/ping_lifecycle_test.go
pkg/apis/sources/v1alpha1/sinkbinding_conversion_test.go
pkg/apis/sources/v1alpha2/apiserver_conversion_test.go
pkg/apis/sources/v1alpha2/apiserver_lifecycle_test.go
pkg/apis/sources/v1alpha2/container_conversion_test.go
pkg/apis/sources/v1alpha2/ping_lifecycle_test.go
pkg/apis/sources/v1beta1/apiserver_lifecycle_test.go
pkg/inmemorychannel/message_dispatcher_test.go
pkg/mtbroker/filter/filter_handler_test.go
pkg/reconciler/apiserversource/apiserversource_test.go
pkg/reconciler/mtbroker/broker_test.go
pkg/reconciler/pingsource/pingsource_test.go
pkg/reconciler/pingsource/resources/receive_adapter_test.go
pkg/reconciler/source/duck/duck.go
pkg/reconciler/source/duck/duck_test.go
pkg/reconciler/testing/v1/trigger.go
pkg/reconciler/testing/v1beta1/trigger.go
test/conformance/helpers/channel_spec_test_helper.go
test/lib/resources/eventing.go

[skonto]

I can do that could you assign me to it.

[pierDipi]

@skonto You can comment with /assign