ai-gov: http and path policies

[craig-osterhout]

Description

Document HTTP method and path rules. A network rule can match specific HTTP
methods and URL paths on a destination.

Split from #26051. Branched off #26059, so this diff includes that PR's changes
until it merges. The HTTP-only changes are 7 files.

Page	What changed
concepts.md	Method, destination, and path syntax, plus how HTTP and network rules combine. Nested under Network rules, since an HTTP rule is a network rule with a method and path
network.md	Introduces the capability and routes to both configuration paths
local.md	--method and --path how-to, split out from the existing rule management. Troubleshooting entry for a method or path blocked on an allowed host
organization.md	The rule composer, including the All traffic and HTTP rule types, and how the composer's any (*) differs from the CLI's --method ANY. Note that HTTP rules are evaluated per request, and guidance to keep HTTP rules out of an approval-required policy
monitoring.md	--type http listing with the method and path columns, and the (L4) and (L7) labels in the summary
_index.md & _index.md	Network bullet notes the new granularity

Related issues or tickets

ENGDOCS-3373

Reviews

• Technical review
• Editorial review
• Product review

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