[Cisco]Fix programmed status for resolved named next-hop groups

[selekkala]

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
• pre-commit run

Summary

getNextHopGroups() and getNamedNextHopGroups() can report
isProgrammed=false for a named next-hop group that has been successfully
resolved and programmed.

The named-group lookup uses the original client NextHopSetID, while the FIB
forwarding entry contains the resolved and normalized IDs after recursive
resolution. As a result, the original ID is absent from the route reference
counts used to compute isProgrammed.

This change:

• Collects original client next-hop set IDs only from resolved FIB routes that
  have a resolved next-hop set ID.
• Includes those IDs when computing isProgrammed in both next-hop-group
  Thrift GET APIs.
• Leaves the existing resolved/normalized route and MySID reference-count
  behavior unchanged.
• Adds state and Thrift regression coverage for resolved, unresolved, used,
  and unused named next-hop groups.

Test Plan

Validated the fix with focused unit tests in Docker:

• FibInfoTest.GetResolvedClientNextHopSetIdsFromRoutes
  • Creates resolved and unresolved FIB routes with different client and
    resolved next-hop set IDs.
  • Verifies that only a resolved route contributes its original client ID.
• NamedNextHopGroupThriftTest.getNextHopGroupsNamedIsProgrammed
  • Adds referenced and unreferenced named next-hop groups.
  • Adds a resolvable route that references one named group.
  • Calls both getNextHopGroups() and getNamedNextHopGroups().
  • Verifies the referenced group returns isProgrammed=true, unreferenced
    groups return false, and both APIs return the same status.

Result: 2/2 tests passed. Formatting and whitespace checks also passed.

Unit-test log

[==========] Running 2 tests from 2 test suites.
[----------] 1 test from NhgIsProgrammedDockerTest
[ RUN      ] NhgIsProgrammedDockerTest.GetResolvedClientNextHopSetIdsFromRoutes
[       OK ] NhgIsProgrammedDockerTest.GetResolvedClientNextHopSetIdsFromRoutes (0 ms)

[----------] 1 test from NamedNextHopGroupDockerTest
[ RUN      ] NamedNextHopGroupDockerTest.GetNextHopGroupsNamedIsProgrammed
[       OK ] NamedNextHopGroupDockerTest.GetNextHopGroupsNamedIsProgrammed (165 ms)

[==========] 2 tests from 2 test suites ran. (166 ms total)
[  PASSED  ] 2 tests.