Use environment independent operator-sdk CLI version

[astefanutti]

The operator-sdk CLI binary is used for the generation of the OLM bundle. Currently it is expected to be present in the PATH, which leads to results that are environment dependent. As the operator-sdk CLI often introduces breaking changes, this leads to regressions and wasted cycles.

Similarly to what we did for controller-gen and kustomize CLI binaries, for which we use expected versions retrieved locally, the generation of the OLM bundle should rely on a fixed version of the operator-sdk CLI that's also retrieved locally.

[github-actions]

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[astefanutti]

Fixed by @phantomjinx in #2284.