Kbauer/use dockerized ocb

[kb-newrelic]

Summary

• Use dockerized ocb instead of manually compiling ocb
• Versioning
  • ocb version is implicitly defined by otelcol_version in manifest. This also gets rid of version in build.mk potentially diverging from version in manifest
  • oldest version of dockerized ocb is 0.112.0. Compiling older versions of component with it, caused all kind of weird errors, so I ended up having to bump versions to 0.112.0
    • >= 0.113.0 removes support for otelcol_version in manifest, so I decided to leave that version bump for a separate PR to not complicate things even more.
    • The only relevant change for us is loggingexporter getting replaced by debugexporter, see also this draft PR we already had pending
• Refactored makefiles to
  • simplify debugging
  • avoid unnecessary builds by defining file dependencies
  • pave the way for maintaining multiple distros by using delegation targets for build (previously only for checks)

Makefile refactoring

As part of debugging the license file generatio, I ended up refactoring and hopefully simplifying the Makefile structure as the old structure was copied from the otel repo and is more complicated than we need it to be.

• moved 'delegation targets' generated for each distro from check.mk to Makefile as they were using the variable ALL_DISTRIBUTIONS which was defined there and are now also used in the build targets, so it makes sense to have defined in the 'root' Makefile.
• 'build' targets were modified to be distro-specific and to not run if sources (_build/go.mod acting as representative) or binary are already created. They were also moved from build.mk to Makefile.common where the already distro-specific 'check' targets where defined. build.mk and check.mk ar included in Makefile and include top-level targets to build/check all distros.
• changed 'license' targets to depend on 'generate-sources' instead of 'build' as they only require the sources, not the binary.

Misc

• go version is implictly defined by the ocb image, so no need to allow specifying it
• Explicitly define providers instead of relying on ocb defaults, see also 0.111.0 known bugs

[kb-newrelic]

TODO: figure out where discrepancy between local machine and CI comes from (build is failing)

[kb-newrelic]

• diff is due to ci generating an empty license file, so the new build process is not yet compatible with ci
• still unclear why my local machine generates a different license file than mailo-nr on their machine for a very similar change

[kb-newrelic]

Closing this to reopen a new PR as I can't wrap my head around the license file discrepancies and want to rule out build machine reuse.