Fix: update 'no metadata found' error message

[capndave]

Description

Update the following error: No metadata found. There is more than once class-validator version installed probably. You need to flatten your dependencies.

• Update the error message with correct grammar
• Add a sentence explaining that validation flags are expected but not present in the code.

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

Fixes

fixes #1124

[capndave]

@typestack @MichalLytek @jotamorais how do I get this to pass the semantic PR check? Have been fooling with it for over an hour and still won't pass

[lukeca362]

@capndave try editing the PR title to lowercase F
i.e. fix: update 'no metadata found' error message

[braaar]

@capndave could you rebase/merge this and get rid of the irrelevant changes?

[NoNameProvided]

Fixed in f6f1bdf. I did not understand the second reason, so I slightly modified the proposed message.

[github-actions]

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