[UI] Add alert tab in the new node page

[ChengYanJin]

Component: ui, nodes

Context: Add alerts for Node page.

Summary:

• Add active alert in Alert Tab
• Reuse the <ActiveAlertFilter/> component from @alexis-ld to filter the alerts base on severity.
• Reuse the <ActiveAlertsCounter/> component from @alexis-ld to display the alerts in Overview tab and be able to redirect to the Alert tab
• Update the theme.json base on the final dark-theme color-palette.

Acceptance criteria:

---

Closes: #2775

[bert-e]

Hello chengyanjin,

My role is to assist you with the merge of this
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[bert-e]

Integration data created

I have created the integration data for the additional destination branches.

• this pull request will merge improvement/2775-add-alert-tab-in-the-new-node-page into
  development/2.6
• w/2.7/improvement/2775-add-alert-tab-in-the-new-node-page will be merged into development/2.7

The following branches will NOT be impacted:

• development/1.0
• development/1.1
• development/1.2
• development/1.3
• development/2.0
• development/2.1
• development/2.2
• development/2.3
• development/2.4
• development/2.5

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[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• one peer

Peer approvals must include at least 1 approval from the following list:

• @tcarmet

• @NicolasT

• @lucieleonard

• @alexandre-allard-scality

• @MonPote

• @slaperche-scality

• @TeddyAndrieux

• @cmonfort

• @thomasdanan

• @carlito-scality

• @jbertran

• @sayf-eddine-scality

• @gdemonet

• @nootal

[thomasdanan]

excellent !!!

If I had one thing to change, I would suggest improving the alert severity selector. We may want to tackle this improvement later on, in one other ticket.