Release 7.6.0 version of the che-plugin-registry

[ibuziuk]

What does this PR do?

Release 7.6.0 version of the che-plugin-registry - eclipse-che/che#15504

• Bumping VERSION file
• Adding '7.6.0' versions for che-theia & machine-exec
  • NOTE che-theia 7.6.0 is supposed to be build on quay - https://quay.io/repository/eclipse/che-theia
• Setting 'latest' version for che-theia and machine-exec plugins to '7.6.0'
• Setting '7.6.0' version for container runtime images of the che remote plugins - find . -name '*.yaml' -exec sed -i -e 's/:next/:7.6.0/g' {} \;
  • NOTE not sure if this step is needed after - fix(theia-endpoint): Use tagged images for the theia plug-ins sidecar #306

It is strange though that eclipse/che-remote-plugin-runner-java8 is still on dockerhub

[benoitf]

FYI it seems ECA check is failing

[ibuziuk]

FYI it seems ECA check is failing

@benoitf I'm not sure why. I have added Signed-off-by: Ilya Buziuk <ibuziuk@redhat.com> to the last commit - 7248bd3

Fixed after update

[amisevsk]

I don't see an ECA check on this PR, is it disabled?

[amisevsk]

LGTM in general, though we should verify that the changes to cobol-language-support and debugger-for-mainframe do not negatively impact the plugins.