feat(26.04): add frr slices

[zhijie-yang]

Proposed changes

This PR adds the slice definition of FRR on 26.04

Related issues/PRs

Forward porting

N/A

Checklist

• I have read the contributing guidelines
• I have tested my changes (see how)
• I have already submitted the CLA form

Additional Context

[lczyk]

• plagued by ci: networking error preparing lxd in tests (1) #752

[github-actions]

Test Coverage

Average Total Coverage: 44.44%

---

Arch: aarch64

Coverage: 44.44%

frr: 🌂 77.78% (2 missing)

frr_dist
frr_modules

frr-pythontools: 🌂 22.22% (7 missing)

frr-pythontools_bins
frr-pythontools_config
frr-pythontools_daemons
frr-pythontools_dist
frr-pythontools_frr-reload
frr-pythontools_libs
frr-pythontools_modules

iproute2: 🌂 44.44% (5 missing)

iproute2_daemons
iproute2_frr-reload
iproute2_libs
iproute2_modules
iproute2_scripts

libyang3: 🌂 33.33% (6 missing)

libyang3_bins
libyang3_config
libyang3_daemons
libyang3_dist
libyang3_frr-reload
libyang3_scripts

---

Arch: x86_64

Coverage: 44.44%

frr: 🌂 77.78% (2 missing)

frr_dist
frr_modules

frr-pythontools: 🌂 22.22% (7 missing)

frr-pythontools_bins
frr-pythontools_config
frr-pythontools_daemons
frr-pythontools_dist
frr-pythontools_frr-reload
frr-pythontools_libs
frr-pythontools_modules

iproute2: 🌂 44.44% (5 missing)

iproute2_daemons
iproute2_frr-reload
iproute2_libs
iproute2_modules
iproute2_scripts

libyang3: 🌂 33.33% (6 missing)

libyang3_bins
libyang3_config
libyang3_daemons
libyang3_dist
libyang3_frr-reload
libyang3_scripts