Add knapsack_pro 9 and 10 appraisals

[anmarchenko]

What does this PR do?

Adds knapsack_pro 9 and 10 appraisals for both the RSpec and auto-instrumentation integrations.

RubyGems reports knapsack_pro 9.2.3 and knapsack_pro 10.0.1 as stable, non-yanked releases. The appraisal family now spans knapsack_pro 7 through 10 and includes:

• knapsack_pro-9-rspec-3
• knapsack_pro-10-rspec-3
• generated gemfiles and lockfiles for every supported Ruby runtime
• matching TEST_METADATA entries for knapsack_rspec and knapsack_auto_instrument

Ruby support

knapsack_pro 9 and 10 require Ruby >= 3.0. Their appraisals therefore exclude Ruby 2.7 and support Ruby 3.0 through 4.0.

No library compatibility changes were required.

Validation

• APPRAISAL_GROUP=knapsack_pro-9-rspec-3 bundle exec appraisal install — passed
• APPRAISAL_GROUP=knapsack_pro-10-rspec-3 bundle exec appraisal install — passed
• bundle exec rake test:knapsack_rspec test:knapsack_auto_instrument — knapsack_pro 7, 8, 9, and 10 appraisals passed on the host Ruby
• ruby -c Appraisals — passed
• bundle exec standardrb Appraisals Rakefile — passed
• git diff --cached --check — passed before commit

This PR supersedes #550.

[datadog-datadog-prod-us1-2]

More details

The Ruby-version guard correctly omits knapsack_pro 9 on Ruby 2.7 while generating the appraisal on Ruby 3.0 and newer, and the six committed gemfile/lockfile pairs match that matrix. No diff-only behavioral regression was reproduced; full Bundler task execution was unavailable because the sandbox could not fetch the repository's existing dd-trace-rb Git dependency.

Was this helpful? React 👍 or 👎

_{📊 Validated against 8 scenarios · Open Bits AI session}

_{🤖 Datadog Autotest · Commit 6676701 · What is Autotest? · @DataDog review to ask questions · Any feedback? Reach out in #autotest}

[datadog-datadog-prod-us1-2]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 97.30% (+0.00%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: c5ae9af | Docs | Datadog PR Page | Give us feedback!}

[anmarchenko]

Consolidated update: this PR now covers both knapsack_pro 9 and 10 in one appraisal-family change. The helper spans 7..10, both knapsack_rspec and knapsack_auto_instrument TEST_METADATA axes and generated files are included, and Ruby < 3.0 remains excluded based on the dependency requirement. The combined targeted tasks for all four majors, Appraisals syntax check, scoped StandardRB, and diff checks pass. #550 is superseded by this PR.