refactor: isolate Database Lab Engine code

Description

Isolate Database Lab Engine code to run pipelines in a more reliable way and avoid a mess with the Engine code base:

• move into the separate engine directory:
  • DLE code(including CLI, CI Checker, common packages, etc.)
  • configuration files
  • DLE linter rules
  • Dockerfiles
  • Makefile
  • building scripts
  • SwaggerUI definitions
  • bash tests
• split GitLab CI specifications
• update GitLab CI jobs
• update .gitignore files

Related issue

Examples

Checklist

• the MR description has been reviewed
• this MR does NOT have text changes OR there are text changes and they have been reviewed
• this MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed
• this MR does NOT have UI changes OR there are UI changes and they have been reviewed

requested review from @fomin.list, @NikolayS, and @vitabaks

assigned to @akartasov

approved this merge request

changed the description

Looks good to me, @akartasov

One thing: UI is located in web, but it's not actually WWW, it's just UI in browser. And it's, actually, also part of the engine (one of 3 interfaces; but I guess we can keep it separated because it's written on different language than API or CLI).

So how about renaming web -> ui here?

added 1 commit

• 2c9df131 - fix: [engine] change script path

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added 1 commit

• 3b8a9ffd - fix: [engine] change artifacts path

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added 1 commit

• 5abc3cb3 - fix: [engine] update configuration paths in bash tests

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added 1 commit

• a2f19dd8 - refactor: [engine] move tests into the engine dir

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marked the checklist item the MR description has been reviewed as completed

marked the checklist item this MR does NOT have text changes OR there are text changes and they have been reviewed as completed

marked the checklist item this MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed as completed

marked the checklist item this MR does NOT have UI changes OR there are UI changes and they have been reviewed as completed

resolved all threads

enabled an automatic merge when the pipeline for a2f19dd8 succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• 07d75116 - fix: [engine] fix script path

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mentioned in commit f3c4575c

merged