[DOCS] Add ServiceNow to email alerts Cloud documentation

[NathanFarmer]

Changes

• Added ServiceNow to the list of supported third-party services in the intro paragraph
• Added *.service-now.com to the default allowed third-party domains in the "Create an email alert" section
• Added *.service-now.com to the default allowlist in the "Update your organization's email domain allowlist" section

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.26%. Comparing base (3bf7087) to head (32dcb4d).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #11669   +/-   ##
========================================
  Coverage    84.26%   84.26%           
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  Files          473      473           
  Lines        39748    39748           
========================================
  Hits         33494    33494           
  Misses        6254     6254           

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3.11 athena	?
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3.11 clickhouse	?
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3.11 mysql	?
3.11 openpyxl or pyarrow or project or sqlite or aws_creds	?
3.11 postgresql	?
3.11 spark_connect	?
3.12	72.74% <ø> (ø)
3.12 athena	?
3.12 aws_deps	?
3.12 big	?
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3.12 openpyxl or pyarrow or project or sqlite or aws_creds	?
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3.13	72.74% <ø> (ø)
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3.13 mssql	52.48% <ø> (ø)
3.13 mysql	51.11% <ø> (ø)
3.13 openpyxl or pyarrow or project or sqlite or aws_creds	59.23% <ø> (ø)
3.13 postgresql	54.74% <ø> (ø)
3.13 snowflake	53.26% <ø> (ø)
3.13 spark	55.33% <ø> (ø)
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