auto-attach: make error message clearer

[renanrodrigo]

Why is this needed?

This PR solves all of our problems because now we tell people to run auto-attach after upgrades, and users are seeing the generic error.
When a machine tries to auto-attach and the contract server returns an error, print hints on what could have happened together with the error details.

Test Steps

Integration test is good, can be tried in any cloud manually.

Checklist

• I have updated or added any unit tests accordingly
• I have updated or added any integration tests accordingly
• Changes here need to be documented, and this was done in:

Does this PR require extra reviews?

• Yes
• No

[github-actions]

🌎 This PR changes translatable messages. 🌏

Please select which scenarios apply. For further explanation, please read our policy on message changes.

• New messages are being added.
  • We will ask translators to take a look and add translations if they have time, but it will not block this PR.
• Existing messages are being changed.
  • ⚠️ Please add a comment with justification of why messages are being altered.
  • If the changes are trivial (e.g. a typo fix), then translations must be preserved.
  • If the changes are substantial, then we will ask translators to take a look and update translations if they have time, but it will not block this PR.
• Existing messages are being deleted.
  • No special action needed.

[github-actions]

Jira: This PR is not related to a Jira item. (The PR title does not include a SC-#### reference)

GitHub Issues: No GitHub issues are fixed by this PR. (No commits have Fixes: #### references)

Launchpad Bugs: No Launchpad bugs are fixed by this PR. (No commits have LP: #### references)

Documentation: The changes in this PR do not require documentation changes.

👍 this comment to confirm that this is correct.

[renanrodrigo]

Please add a comment with justification of why messages are being altered

Updating the message is the whole point of this PR

If the changes are substantial, then we will ask translators to take a look and update translations if they have time, but it will not block this PR.

No translation for this one yet anyway.

[orndorffgrant]

LGTM!

[renanrodrigo]

rebased and got rid of conflicts

[renanrodrigo]

re rebased and the maybe line is gone; merging