Apply 30s default timeout to AWS calls

[Cool-fire]

This change standardizes timeout handling across the project.

What changed:

• Added a shared defaultOperationTimeout constant set to 30 seconds in pkg/service/service.go
• Wrapped AWS config loading and STS assume-role calls with that default timeout
• Wrapped each AWS scaling API call (Kinesis, EC2 Auto Scaling, ElastiCache, DynamoDB Application Auto Scaling) with the same default timeout

Why:

• A repo-wide search found no existing default timeout settings to align with
• The request was to normalize defaults across the codebase; with no prior standard present, this adopts 30 seconds as the single project default
• Centralizing the timeout avoids drift between services and ensures every outbound AWS operation has a bounded default

Verification:

• git diff --check ✅
• go version ❌ /usr/bin/bash: line 1: go: command not found
• gofmt -w pkg/service/... ❌ /usr/bin/bash: line 1: gofmt: command not found

Limitations:

• The sandbox does not have the Go toolchain installed, so I could not run make, go build, or gofmt here.

Files changed

pkg/service/dynamodb.go    |  6 +++++-
 pkg/service/ec2.go         |  5 ++++-
 pkg/service/elasticache.go | 10 ++++++++--
 pkg/service/kinesis.go     |  5 ++++-
 pkg/service/service.go     | 17 +++++++++++++++--
 5 files changed, 36 insertions(+), 7 deletions(-)

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