RetryConfig.RequestTimeout to configure the timeout of a single request

[slinkydeveloper]

Part of #5148

Proposed Changes

• 🎁 Add RetryConfig.RequestTimeout to configure the timeout of a single request when using kncloudevents.HTTPMessageSender

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior: N/A
• Docs PR for any user-facing impact: N/A
• Spec PR for any new API feature: N/A
• Conformance test for any change to the spec: N/A

[slinkydeveloper]

/hold

This requires the lazy consensus approval per https://github.com/knative/eventing/blob/main/docs/experimental-features.md#feature-proposal-development-and-graduation-process

[codecov]

Codecov Report

Merging #5503 (407cd61) into main (b312f0e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5503      +/-   ##
==========================================
+ Coverage   82.56%   82.58%   +0.01%     
==========================================
  Files         198      198              
  Lines        6125     6131       +6     
==========================================
+ Hits         5057     5063       +6     
  Misses        741      741              
  Partials      327      327              

Impacted Files	Coverage Δ
pkg/kncloudevents/retries.go	84.61% <ø> (ø)
pkg/kncloudevents/message_sender.go	89.65% <100.00%> (+2.69%)	⬆️

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[slinkydeveloper]

/unhold

https://groups.google.com/g/knative-dev/c/7h1p0eBmUuo/m/lTzaSULKAQAJ

[matzew]

the verify was recently (no idea why) also failing a few times for me

[slinkydeveloper]

Let me try to rebase

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/kncloudevents/message_sender.go	85.7%	88.2%	2.5

[slinkydeveloper]

@matzew now it pass :)

[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, slinkydeveloper

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Needs approval from an approver in each of these files:

• OWNERS [matzew,slinkydeveloper]

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