Fix integration log checking

[luisgonzalex]

What does this PR do?

Two ways we decide whether an intg. has log support

1. It has a logs section in the config
2. It has a logs section in the readme

Checking the readme was looking for "# Log collection", but we don't seem to be consistent on the casing. It seems like # Log collection is the most popular.

We can either accept it and use this PR or I can make the change for all intgs. to use the correct casing. WDYT?

➜ git grep "# Log Collection"
aspdotnet/README.md:#### Log Collection
cassandra/README.md:##### Log Collection
cilium/README.md:##### Log Collection
clickhouse/README.md:##### Log Collection
datadog_checks_dev/datadog_checks/dev/tooling/templates/integration/logs/{check_name}/README.md:### Log Collection
ecs_fargate/README.md:### Log Collection
fluentd/README.md:##### Log Collection
harbor/README.md:##### Log Collection
mcache/README.md:#### Log Collection
proxysql/README.md:##### Log Collection
sidekiq/README.md:### Log Collection
vault/README.md:#### Log Collection
vertica/README.md:#### Log Collection
voltdb/README.md:#### Log Collection

➜ git grep "# Log collection"
kafka/README.md:##### Log collection
kafka/README.md:##### Log collection
kafka_consumer/README.md:##### Log collection
kong/README.md:##### Log collection
kong/README.md:##### Log collection
kube_scheduler/README.md:#### Log collection
kyototycoon/README.md:##### Log collection
lighttpd/README.md:#### Log collection
linkerd/README.md:##### Log collection
mapr/README.md:#### Log collection
mapreduce/README.md:##### Log collection
marathon/README.md:##### Log collection
marathon/README.md:##### Log collection
.... and much more

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[mgarabed]

Without a uniform README standard, this seems like the correct approach.