chore: remove old announcements

[FrederikBolding]

Description

This PR removes old announcements for the "Snaps Open Beta" and the "Buy & Sell" feature. This PR also adds a date to the simulations announcement, effectively sorting it to the top (by request of @Montoya).

[Montoya]

Hi @MetaMask/extension-admins, this change is agreed to by product leads for Wallet UX, Ramps, and Snaps.

[metamaskbot]

Builds ready [57ac8a8]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • content-script: 0
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (868 ± 515 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	74	161	108	26	12
		domContentLoaded	10	63	26	11	5
		load	61	2514	868	1073	515
		domInteractive	10	63	26	11	5

Bundle size diffs [🚀 Bundle size reduced!]

• background: 0 Bytes (0.00%)
• ui: -430 Bytes (-0.01%)
• common: -1.86 KiB (-0.03%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.47%. Comparing base (ab2fa3e) to head (57ac8a8).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #23940      +/-   ##
===========================================
- Coverage    67.49%   67.47%   -0.02%     
===========================================
  Files         1244     1244              
  Lines        48778    48772       -6     
  Branches     12726    12721       -5     
===========================================
- Hits         32921    32907      -14     
- Misses       15857    15865       +8     

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