[WIP]fix: Add -mod=readonly to ginkgo version fetch and go install

[michael-valdron]

Description of Changes

Fixes the ginkgo not found and ginkgo version fetch failures by adding -mod=readonly to the go list part of the ginkgo version fetch statement and the go install command.

Related Issue(s)

resolves devfile/api#1737

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michael-valdron

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[michael-valdron]

Ignoring EC failure as the fix is blocked by this issue.

[michael-valdron]

Hmmm.. this might need further investigation into what is going on, this change did fix this problem in my local testing using the openshift release image 😕

I'll put this PR in WIP for now.

[michael-valdron]

Can reproduce error in latest fail under a local pull of the runner image:

+ go install github.com/onsi/ginkgo/v2/ginkgo@v2.19.0
go: github.com/onsi/ginkgo/v2/ginkgo@v2.19.0: cannot query module due to -mod=vendor

When I add -mod=readonly also to go install the problem is resolved:

+ go install -mod=readonly github.com/onsi/ginkgo/v2/ginkgo@v2.19.0
go: downloading github.com/onsi/ginkgo/v2 v2.19.0
go: downloading golang.org/x/tools v0.21.0
go: downloading github.com/go-task/slim-sprig/v3 v3.0.0
go: downloading github.com/google/pprof v0.0.0-20240424215950-a892ee059fd6

[openshift-ci]

@michael-valdron: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.16-registry-test	fca92ac	link	true	/test v4.16-registry-test

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