[lilypan26]

What this PR does / why we need it:
trigger fresh vhd build upon updates to components.json so e2es do not fail validation when expecting newest component version with stale vhd build

Which issue(s) this PR fixes:

Fixes #

[github-actions]

Windows Unit Test Results

  3 files   21 suites   51s ⏱️
789 tests 789 ✅ 0 💤 0 ❌
815 runs  815 ✅ 0 💤 0 ❌

Results for commit faeeab0.

[github-actions]

Package	Line Rate	Health
test	0%	❌
windows	27%	❌
staging_cse_windows Package 1	71%	➖
debug	0%	❌
provisioningscripts	2%	❌
parts_windows Package 1	73%	➖
Summary	39% (1983 / 7220)	❌

[Copilot]

🟢 Approval recommended

No active review issues are recorded for the component-triggered VHD builds and related documentation changes.

No open issues 🎉

What changed in this PR

This PR triggers fresh VHD builds when component definitions change on main, reducing stale-image mismatches in standalone E2E validation.

Changes:

• Enables the VHD release pipeline trigger for changes to parts/common/components.json on main.
• Documents the component-triggered builds and the daily 09:00 UTC build schedule.

File	Description
e2e/​README.md	Documents when images used by standalone E2E jobs are refreshed.
.pipelines/​.vsts-vhd-builder-release.yaml	Adds branch and path filters to trigger builds on component updates.

_{Review effort: Balanced}

[github-actions]

Package	Line Rate	Health
shellspec spec	30%	❌
Summary	30% (4912 / 16591)	❌

[github-actions]

Package	Line Rate	Health
github.com/Azure/agentbaker/aks-node-controller	73%	➖
github.com/Azure/agentbaker/aks-node-controller/common	100%	✔
github.com/Azure/agentbaker/aks-node-controller/helpers	68%	➖
github.com/Azure/agentbaker/aks-node-controller/parser	88%	✔
github.com/Azure/agentbaker/aks-node-controller/pkg/gpu	100%	✔
github.com/Azure/agentbaker/aks-node-controller/pkg/nodeconfigutils	92%	✔
github.com/Azure/agentbaker/aks-node-controller/utils	0%	❌
github.com/Azure/agentbaker/apiserver	24%	❌
github.com/Azure/agentbaker/cmd	0%	❌
github.com/Azure/agentbaker/cmd/starter	0%	❌
github.com/Azure/agentbaker/fuzz/api	0%	❌
github.com/Azure/agentbaker/hotfix/render-nodecustomdata	35%	❌
github.com/Azure/agentbaker/pkg/agent	79%	➖
github.com/Azure/agentbaker/pkg/agent/datamodel	77%	➖
github.com/Azure/agentbaker/pkg/agent/toggles	0%	❌
github.com/Azure/agentbaker/pkg/vhdbuilder/datamodel	87%	✔
Summary	76% (6093 / 8041)	➖