Add HasActivityInfo to avoid panic recover on GetActivityInfo

[Normal]

Detailed Description
Added a new method HasActivityInfo to activity.go.

We use GetActivityInfo a lot to create some metrics in one core component. This component is heavily used in the system and called not only from cadence activities but also in other places. The current implementation of GetActivityInfo panicking if called not from the activity, it forces us to use panic-recover pattern which works but pollutes logs a lot:

defer func() {
    if r := recover(); r != nil {
        // Recovered from panic, context is not an activity context
    }
}()
info = activity.GetInfo(ctx)

We would like to avoid it with this:

if activity.HasInfo(ctx) {
    info = activity.GetInfo(ctx)
}

Impact Analysis

• Backward Compatibility: it is compatible as the changeset only introduces a new method, current functions are unchanged
• Forward Compatibility: it is compatible as the changeset doesn't introduce any new types, contracts and new function doesn't store any data

Testing Plan

• Unit Tests: Yes
• Persistence Tests: N/A
• Integration Tests: No
• Compatibility Tests: No

Rollout Plan

• What is the rollout plan?
  Merge it and release a new client version
• Does the order of deployment matter?
  No
• Is it safe to rollback? Does the order of rollback matter?
  Safe to rollback, the order doesn't matter
• Is there a kill switch to mitigate the impact immediately?
  No, not needed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.20%. Comparing base (ba6fe77) to head (c232cf2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Coverage Δ
internal/activity.go	89.90% <100.00%> (+0.18%)	⬆️
internal/internal_activity.go	62.15% <100.00%> (+0.45%)	⬆️

... and 2 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ba6fe77...c232cf2. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.