feat: Disables HTML rendering in Toast by default

[michael-s-molina]

SUMMARY

This PR disables HTML rendering in toast messages by default. I couldn't find any instances of toast messages with HTML content but it is a valid use case, so I created an allowHtml property for this scenario.

TESTING INSTRUCTIONS

1 - Make sure toast messages don't render HTML by default
2 - Make sure toast messages render HTML if allowHtml is enabled

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[michael-s-molina]

Reviewers, please let me know if we actually have an instance where we use HTML in toast messages already. I couldn’t find one.

[kgabryje]

Lgtm. I'm not aware of any toast with html content

[lyndsiWilliams]

LGTM! I did a quick scour through the code and it doesn't look like we have any existing toasts with HTML, I think this should be safe to implement 😁

[rusackas]

LGTM!

[codecov]

Codecov Report

Merging #21853 (009fc23) into master (383dc29) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #21853      +/-   ##
==========================================
- Coverage   66.93%   66.92%   -0.01%     
==========================================
  Files        1805     1805              
  Lines       69066    69070       +4     
  Branches     7369     7373       +4     
==========================================
+ Hits        46227    46228       +1     
- Misses      20932    20936       +4     
+ Partials     1907     1906       -1     

Flag	Coverage Δ
javascript	53.33% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...et-frontend/src/components/MessageToasts/Toast.tsx	78.78% <ø> (ø)
...d/plugins/plugin-chart-echarts/src/utils/series.ts	84.29% <0.00%> (ø)
...ugins/plugin-chart-echarts/src/utils/annotation.ts	86.27% <0.00%> (ø)
...lugin-chart-echarts/src/Timeseries/transformers.ts	50.00% <0.00%> (ø)
...chart-echarts/src/Timeseries/EchartsTimeseries.tsx	0.00% <0.00%> (ø)
...ols/MetricControl/AdhocMetricEditPopover/index.jsx	75.53% <0.00%> (+1.06%)	⬆️

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