Fix error due to undefined options

[atif-saddique-deel]

What does this PR do?

• This PR fixes a bug where, when options are undefined, doing options.timeout throws error and crash the whole node process.
• The error thrown is Cannot read properties of undefined (reading 'timeout')
• Open github issue: Cannot read properties of undefined (reading 'timeout') #3939
• Here is the stack-trace.

TypeError: Cannot read properties of undefined (reading 'timeout')
    at HttpClientPlugin.error (/usr/src/app/node_modules/dd-trace/packages/datadog-plugin-http/src/client.js:125:39)
    at /usr/src/app/node_modules/dd-trace/packages/dd-trace/src/plugins/tracing.js:73:22
    at Subscription._handler (/usr/src/app/node_modules/dd-trace/packages/dd-trace/src/plugins/plugin.js:14:9)
    at Channel.publish (node:diagnostics_channel:141:9)
    at req.emit (/usr/src/app/node_modules/dd-trace/packages/datadog-instrumentations/src/http/client.js:101:30)
    at Socket.emitRequestTimeout (node:_http_client:847:9)
    at Object.onceWrapper (node:events:631:28)
    at Socket.emit (node:events:529:35)
    at Socket.emit (node:domain:552:15)
    at Socket.emit (/usr/src/app/node_modules/dd-trace/packages/datadog-instrumentations/src/net.js:61:25)
    at Socket._onTimeout (node:net:598:8)
    at listOnTimeout (node:internal/timers:569:17)
    at process.processTimers (node:internal/timers:512:7)

Motivation

There was a bug introduced in version v4.21.0 here and this PR fixes that bug.

Plugin Checklist

• Unit tests.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CircleCI jobs/workflows.
• Plugin is exported.

Additional Notes

Security

Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[simon-id]

I've recreated your PR in #4029 to allow the CI to run. I've cherrypicked your commit so you keep authorship!