[MM-61120] Add diagnostics data to the Support Packet

[hanzei]

Summary

When a Support Packet gets generated, the plugin now includes diagnostics data via a diagnostics.yaml file into the Packet.

Example content of com.github.manland.mattermost-plugin-gitlab/diagnostics.yaml:

version: 1.9.1+772eab6
connected_user_count: 0
is_oauth_configured: false

Requires mattermost/mattermost#28833 on the server side

Ticket Link

https://mattermost.atlassian.net/browse/MM-61120

[wiggin77]

LGTM 👍 Bump the golangci version to 1.55.0 to fix the CI issue.

See https://github.com/mattermost/mattermost-plugin-jira/pull/1136/files

[hanzei]

@wiggin77 @Kshitij-Katiyar The CI error seems unrelated. Is that a known issue?

[hanzei]

@Kshitij-Katiyar Gentle reminder to review the PR

[hanzei]

@AayushChaudhary0001 Can you please give the PR a review?

[hanzei]

@Kshitij-Katiyar @AayushChaudhary0001 Can you please review the PR ASAP so we can get it into v1.10.0? Thanks!

[raghavaggarwal2308]

@hanzei Sure, we will look into it

[arush-vashishtha]

Hey @hanzei , Can you please specify the testing steps for this PR so we can estimate and start working on the testing areas?

[hanzei]

@arush-vashishtha, I've updated the JIRA ticket with QA test steps. Please check out https://mattermost.atlassian.net/browse/MM-61120.

[hanzei]

Per discussion with @raghavaggarwal2308, QA testing will happen post-merge.