feat: Add alert sidebar URL

[piekarski-mateusz]

Closes #5441

📑 Description

Adds a URL that links to an opened alert sidebar for a given alert

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[greptile-apps]

Skipped: This PR does not target one of your configured branches: (refactor/2512-nextjs-15)

[vercel]

@piekarski-mateusz is attempting to deploy a commit to the KeepHQ Team on Vercel.

A member of the Team first needs to authorize it.

[shahargl]

Hey! thanks for opening this PR!

We have some problem with the CI/CD. Going to handle it soon and let this PR in :)

[shahargl]

I guess this is duplicated now by #5444

[piekarski-mateusz]

Hello
I should've added more description to this PR. Apologies. It's not exactly duplicated by #5444
That one allows for customization of the sidebar elements.
This PR adds a shareable URL to an alert with an opened sidebar.
Here are some screenshots visualizing the change:
Before:

After:

[shahargl]

Can you resolve the conflict so I can merge? @piekarski-mateusz

[shahargl]

@piekarski-mateusz - frontend tests fails with

    /home/runner/work/keep/keep/keep-ui/app/(keep)/incidents/[id]/alerts/incident-alerts.tsx:244
        const router = (0, _navigation.useRouter)();
              ^

    SyntaxError: Identifier 'router' has already been declared

      149 |     severity: IncidentSeverity.High,
      150 |     status: IncidentStatus.Firing,
    > 151 |     services: [],
          |                                      ^
      152 |     alert_sources: [],
      153 |     rule_fingerprint: '',
      154 |     alerts_count: 2,

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1505:14)
      at Object.<anonymous> (/home/runner/work/keep/keep/keep-ui/app/(keep)../../../../../../incidents/[id]/alerts/__tests__/incident-alerts.test.tsx:151:64)

[piekarski-mateusz]

@piekarski-mateusz - frontend tests fails with

Tests fixed 👍