feat(build): Add --force-git-metadata flag with CI auto-detection (EME-604) (#2974)

## Summary

- Adds `--force-git-metadata` and `--no-git-metadata` flags to control
git metadata collection for build uploads
- Implements CI detection that automatically enables git metadata only
when running in most CI environments (GitHub Actions, GitLab CI,
Jenkins, etc.)
- Prevents local dev builds from triggering unwanted GitHub status
checks while maintaining automatic behavior for CI builds
- Refactors git metadata handling to use `VcsInfo` directly, eliminating
duplicate `GitMetadata` struct

## Changes

**New CI Detection Module** (`src/utils/ci.rs`):
- Checks common CI environment variables to determine if running in CI
- Based on logic from sentry-android-gradle-plugin

**Build Upload Command** (`src/commands/build/upload.rs`):
- Added two separate boolean flags for clarity:
  - `--force-git-metadata` - Force enable git metadata collection
  - `--no-git-metadata` - Force disable git metadata collection
  - Default (no flag) - Auto-detect CI environment
- Refactored to use `VcsInfo` struct directly instead of intermediate
`GitMetadata` struct
- Simplified string handling in `collect_git_metadata` function

Fixes EME-604

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Daniel Szoke <7881302+szokeasaurusrex@users.noreply.github.com>

Author: 3 people

CHANGELOG.md

@@ -3,7 +3,9 @@
 ## Unreleased
 
 ### Improvements
-
+- For the `sentry-cli build upload` command, we now only auto-detect Git metadata when we detect we are running in a CI environment, unless the user manually overrides this behavior ([#2974](https://github.com/getsentry/sentry-cli/pull/2974)). This change prevents local development builds from triggiering GitHub status checks for size analysis.
+  - We can detect most common CI environments based on the environment variables these set.
+  - We introduced two new arguments, `--force-git-metadata` and `--no-git-metadata`, which force-enable and force-disable automatic Git data collection, respectively, overriding the default behavior.
 - The `sentry-cli build upload` command now automatically detects the correct branch or tag reference in non-PR GitHub Actions workflows ([#2976](https://github.com/getsentry/sentry-cli/pull/2976)). Previously, `--head-ref` was only auto-detected for pull request workflows. Now it works for push, release, and other workflow types by using the `GITHUB_REF_NAME` environment variable.
 
 ## 2.58.2

src/api/data_types/chunking/build.rs

@@ -1,3 +1,5 @@
+use std::borrow::Cow;
+
 use serde::{Deserialize, Serialize};
 use sha1_smol::Digest;
 
@@ -32,15 +34,15 @@ pub struct VcsInfo<'a> {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub base_sha: Option<Digest>,
     #[serde(skip_serializing_if = "str::is_empty", rename = "provider")]
-    pub vcs_provider: &'a str,
+    pub vcs_provider: Cow<'a, str>,
     #[serde(skip_serializing_if = "str::is_empty")]
-    pub head_repo_name: &'a str,
+    pub head_repo_name: Cow<'a, str>,
     #[serde(skip_serializing_if = "str::is_empty")]
-    pub base_repo_name: &'a str,
+    pub base_repo_name: Cow<'a, str>,
     #[serde(skip_serializing_if = "str::is_empty")]
-    pub head_ref: &'a str,
+    pub head_ref: Cow<'a, str>,
     #[serde(skip_serializing_if = "str::is_empty")]
-    pub base_ref: &'a str,
+    pub base_ref: Cow<'a, str>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub pr_number: Option<u32>,
 }