forbid changes to legacy project imports [MARXAN-1612]

[angelhigueraacid]

This PR adds:

• LegacyProjectImportChecker service. Now block guard checks if a project is blocked depending if there is an ongoing legacy project import for the given project.

Feature relevant tickets

Block legacy projects being imported

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[angelhigueraacid]

Hi @hotzevzl ! The only thing left that i would like to review about this PR is about using this guard when creating a scenario.
Right now in the create method of api/apps/api/src/modules/scenarios/scenarios.service.ts, we are not doing this.blockGuard.ensureThatScenarioIsNotBlocked(scenario.right.id); so we don't check if any of the blocking operation are being made when creating a new scenario. So,¿Is this the case and we don't want to check if any of these blocking operations are being made? Also, i would say we should at least prevent from creating a scenario when the legacy project import is being executed(on the same project).

[hotzevzl]

thanks @angelhigueraacid - all good, except for some naming that in my opinion could be improved for clarity.