Support setting dashboard variables from annotations

### # What went wrong? **What happened**: - **Set Dashboard and panel** should afaik allow defining variables by modifying **Dashboard URL** - **Panel ID** doesn't allow anything to be added, only integer allowed; additions have to be done on **Dashboard URL** - **if dashboard referred in the alert has variables, like "instance", there is no way to define them without dirty hack like this.** Configuration: ``` Dashboard URL: asdfqwerty?var-instance={{ $labels.instance }} ``` Results in broken link in alert: ``` https://grafanahost.foo.bar/grafana/d/asdfqwerty%3Fvar-instance=problemhost.foo.bar?orgId=1&viewPanel=1 ``` **What did you expect to happen**: - Working link to be generated - orgId parameter separator to be & instead of ? - orgId added as last parameter instead of right after **Dashboard URL**, as when **Dashboard URL** is defined, **Panel ID** seems to be mandatory Working link: ``` https://grafanahost.foo.bar/grafana/d/asdfqwerty?var-instance=prooblemhost.foo.bar&viewPanel=1&orgId=1 ``` ### # How do we reproduce it? **Step 1**: - Define an alert with Dashboard URL and Panel ID defined **Step 2**: - have the alert be triggered **Step 3**: - admire borked link ### # What Grafana version are you using? v9.5.2, v9.5.1, probably other versions ### ## Optional Questions: ### Anything else to add? There seems to be some oddity with orgId: If you take the generated broken link: ``` https://grafanahost.foo.bar/grafana/d/asdfqwerty%3Fvar-instance=problemhost.foo.bar?orgId=1&viewPanel=1 ``` And fix the separator only for the orgId... ``` https://grafanahost.foo.bar/grafana/d/asdfqwerty%3Fvar-instance=problemhost.foo.bar&orgId=1&viewPanel=1 ``` ...opening the (still broken) link results in even more orgId with a separator `?` instead of separator `&`: ``` https://grafanahost.foo.bar/grafana/d/asdfqwerty%3Fvar-instance=problemhost.foo.bar&orgId=1&viewPanel=1?orgId=1 ``` It would be nice and convenient in some cases to be abl…