[APPSEC-68561] Fix Rack/Rails body parsing on exception

[Strech]

What does this PR do?

Add safe-guard for request body parsing classes

Motivation:

Fix APPSEC-68561

Change log entry

Yes. Fix Rack-based and Rails request body analysis when body parsing fails

Additional Notes:

None.

How to test the change?

CI

[dd-octo-sts]

Typing analysis

Note: Ignored files are excluded from the next sections.

Untyped methods

This PR clears 1 partially typed method. It increases the percentage of typed methods from 65.77% to 65.81% (+0.04%).

Partially typed methods (+0-1)

✅ Cleared:

sig/datadog/appsec/utils/http/body_reader.rbs:6
└── def self?.read: (untyped body, limit: Integer, ?rewind_before_read: bool) -> String?

[datadog-prod-us1-4]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 90.05% (+0.01%)

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