[MODERATION] organization blocking a user (#802)

- Resolves #476
- Follow up for: #540
- Ensure that the doer and blocked person cannot follow each other.
- Ensure that the block person cannot watch doer's repositories.
- Add unblock button to the blocked user list.
- Add blocked since information to the blocked user list.
- Add extra testing to moderation code.
- Blocked user will unwatch doer's owned repository upon blocking.
- Add flash messages to let the user know the block/unblock action was successful.
- Add "You haven't blocked any users" message.
- Add organization blocking a user.

Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/802
(cherry picked from commit 0505a10421)
(cherry picked from commit 37b4e6ef9b)
(cherry picked from commit 217475385a)

web_src/css/org.css

@@ -190,30 +190,35 @@
 }
 
 .organization.teams .repositories .item,
-.organization.teams .members .item {
+.organization.teams .members .item,
+.organization.settings .blocked-users .item {
   padding: 10px 19px;
 }
 
 .organization.teams .repositories .item:not(:last-child),
-.organization.teams .members .item:not(:last-child) {
+.organization.teams .members .item:not(:last-child),
+.organization.settings .blocked-users .item:not(:last-child) {
   border-bottom: 1px solid var(--color-secondary);
 }
 
 .organization.teams .repositories .item .button,
-.organization.teams .members .item .button {
+.organization.teams .members .item .button,
+.organization.settings .blocked-users .item button {
   padding: 9px 10px;
   margin: 0;
 }
 
 .organization.teams #add-repo-form input,
 .organization.teams #repo-multiple-form input,
-.organization.teams #add-member-form input {
+.organization.teams #add-member-form input,
+.organization.settings #block-user-form input {
   margin-left: 0;
 }
 
 .organization.teams #add-repo-form .ui.button,
 .organization.teams #repo-multiple-form .ui.button,
-.organization.teams #add-member-form .ui.button {
+.organization.teams #add-member-form .ui.button,
+.organization.settings #block-user-form .ui.button {
   margin-left: 5px;
   margin-top: -3px;
 }