[WIP] Align shared steps in 1ES and standalone templates

[Copilot]

• Analyze differences between 1ES and standalone templates
• Identify all Agency CLI references in 1ES template
• Update templates/1es-base.yml: Replace Agency CLI NuGet install with Copilot CLI
• Update templates/1es-base.yml: Replace agency copilot command with copilot
• Update src/compile/onees.rs: Replace AGENCY_CLI_VERSION with COPILOT_CLI_VERSION
• Update src/compile/onees.rs: Add missing {{ workspace }} replacement (pre-existing bug)
• Update src/compile/common.rs: Remove unused AGENCY_CLI_VERSION constant
• Add test for 1ES compilation output (no unreplaced markers, Copilot CLI used)
• All 29 tests pass, standalone template unchanged
• Code review feedback addressed
• Security scan

Original prompt

Let's align shared steps in the 1ES and standalone templates. Standalone template should remain unchanged. References to agency at any location in the 1ES template should be removed and replaced accordingly.

A perfect example of what should be changed is the installation of agency in the 1ES template vs standalone. Use your judgment to determine the correct alignment.

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