feat: make samply profiler default for all OSes

[GuillaumeLagrange]

No description provided.

[greptile-apps]

Greptile Summary

Updates wall-time profiling behavior and test infrastructure:

• Makes Samply the default wall-time profiler on every operating system while retaining explicit Perf and Samply overrides.
• Adds an executable-path override for internal Samply re-execution.
• Builds test-only codspeed and exec-harness binaries through Cargo instead of relying on preinstalled executables.
• Removes environment-based test gates and the corresponding CI installation step.
• Updates the bundled Samply submodule and dependency lockfile.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/executor/wall_time/executor.rs	Changes the default wall-time profiler selection to Samply on every platform.
src/cli/mod.rs	Adds an environment override for the executable used to dispatch internal Samply commands.
src/executor/tests.rs	Builds real workspace binaries on demand and supplies them to wall-time executor tests.
.github/workflows/ci.yml	Removes the redundant exec-harness installation from the main test job.
Cargo.toml	Adds Escargot as a development dependency for test-time Cargo builds.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Wall-time execution requested] --> B{Profiler override}
  B -->|Perf| C[PerfProfiler]
  B -->|Samply| D[SamplyProfiler]
  B -->|None| D
  D --> E[Internal Samply command]
  E --> F{CODSPEED_SELF_EXE set?}
  F -->|Yes| G[Re-execute configured binary]
  F -->|No| H[Re-execute current executable]

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_{Reviews (3): Last reviewed commit: "feat: make samply profiler default for a..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 17 untouched benchmarks

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_{Comparing cod-2796-switch-to-samply-profiler-by-default (c6f4fe8) with main (8018219)}