Add error message for cloning sdk timeout

[Julian-Chu]

Issue #1642:

Description of changes:
add message to remind user to clone aws-go-sdk when timeout due to bad network speed

// original
➜  code-generator git:(main) make build-controller SERVICE=ecr
building ack-generate ... ok.
==== building ecr-controller ====
Copying common custom resource definitions into ecr
Building Kubernetes API objects for ecr
Error: canot clone repository: context deadline exceeded
make: *** [build-controller] Error 1

// with new error message
➜  code-generator git:(main) ✗ make build-controller SERVICE=ecr
building ack-generate ... ok.
==== building ecr-controller ====
Copying common custom resource definitions into ecr
Building Kubernetes API objects for ecr
Error: cannot clone repository: take too long to clone sdk repo, please consider run 'git clone https://github.com/aws/aws-sdk-go' into cache dir /Users/julian/.cache/aws-controllers-k8s/src/aws-sdk-go
make: *** [build-controller] Error 1

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-bot]

Hi @Julian-Chu. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[a-hilaly]

/ok-to-test

[a-hilaly]

Thank you @Julian-Chu !
/lgtm

[ack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: A-Hilaly, Julian-Chu

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