feat(source-gitlab): Increase default concurrency from 8 to 10 (4.4.23-rc.3)

[sophiecuiy]

What

Increases the default concurrency level for source-gitlab from 8 to 10 as the next step in the progressive rollout concurrency tuning process (epic).

RC.2 (which commented out HTTPAPIBudget) showed stable or slightly improved performance vs RC.1 across all pinned actors with zero failures. This RC bumps concurrency to measure the effect of higher parallelism without rate limiting.

How

• manifest.yaml: Change default_concurrency fallback from 8 to 10 (users who set num_workers in config are unaffected)
• metadata.yaml: Bump dockerImageTag from 4.4.23-rc.2 to 4.4.23-rc.3
• gitlab.md: Add changelog entry

Review guide

1. manifest.yaml — single-line concurrency default change
2. metadata.yaml — version bump
3. docs/integrations/sources/gitlab.md — changelog entry (⚠️ verify the PR number 75535 matches this PR's actual number)

User Impact

No immediate user impact — this RC will only be deployed to ~15 pinned actors via progressive rollout. Users who have explicitly configured num_workers are unaffected. If the concurrency increase causes issues (rate limiting, failures), it will be caught during rollout monitoring before wider release.

Can this PR be safely reverted and rolled back?

• YES 💚

Link to Devin session: https://app.devin.ai/sessions/4462c8953c3c483084a62a7240f6973f
Requested by: sophiecuiy

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source-gitlab Connector Test Results

35 tests   31 ✅  1m 23s ⏱️
 2 suites   4 💤
 2 files     0 ❌

Results for commit d879a79.

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