MM-54366 Check guest access to other members

[sbishel]

Summary

Guests should only have access to other members if they are both members of the same channel or board. This PR enforces that on the '/user' post endpoint. Also required fixing queries.

Ticket Link

Fixes https://mattermost.atlassian.net/browse/MM-54366

[mgdelacroix]

LGTM 👍

[esarafianou]

LGTM!

[mattermost-build]

Cherry pick is scheduled.

[sbishel]

/cherry-pick release-7.11

[mattermost-build]

Cherry pick is scheduled.

[mattermost-build]

Error trying doing the automated Cherry picking. Please do this manually

+++ Updating remotes...
Fetching upstream
Failed to add the RSA host key for IP address '140.82.114.4' to the list of known hosts (/app/.ssh/known_hosts).
Fetching origin
Failed to add the RSA host key for IP address '140.82.114.4' to the list of known hosts (/app/.ssh/known_hosts).
+++ Updating remotes done...
+++ Creating local branch automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11-1695651611
Switched to a new branch 'automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11-1695651611'
Branch 'automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11-1695651611' set up to track remote branch 'release-7.11' from 'upstream'.

+++ About to attempt cherry pick of PR #4871 with merge commit 134422df4d6c800312224453129aea8718841ee0.

[automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11-1695651611 25e5a2a8] MM-54366 Check guest access to other members (#4871)
 Author: Scott Bishel <scott.bishel@mattermost.com>
 Date: Mon Sep 25 08:19:53 2023 -0600
 5 files changed, 127 insertions(+), 15 deletions(-)

+++ I'm about to do the following to push to GitHub (and I'm assuming origin is your personal fork):

  git push origin automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11-1695651611:automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11

Failed to add the RSA host key for IP address '140.82.112.3' to the list of known hosts (/app/.ssh/known_hosts).
To github.com:mattermost-build/focalboard.git
 + 3e9a3a05...25e5a2a8 automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11-1695651611 -> automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11 (forced update)

+++ Creating a pull request on GitHub at mattermost-build:automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11
Error creating pull request: Unprocessable Entity (HTTP 422)
A pull request already exists for mattermost-build:automated-cherry-pick-of-focalboard-#4871-upstream-release-7.11.

+++ Returning you to the main branch and cleaning up.