[windows][usm] Fix json parsing for usm

[derekwbrown]

The parsing of datadog.json for USM service tagging was far too restrictive. It assumed all values were always string values, and failed if any entry had a non-string (e.g. bool) value; even though those values are allowed for other keys.

Fixes parser to allow this case, and also updates test to have the additional entries in them.

Motivation

Customer reported issue with USM service tagging not working

Describe how to test/QA your changes

Automated tests in place.

Create a datadog.json in the director

Install IIS.
Create one or more IIS sites in the IIS configuration.

Place a datadog.json or web.config file in the root of the site directory, with any combination of env/version/service tags.
The file formats are documented
https://datadoghq.atlassian.net/wiki/spaces/WKIT/pages/4012835378/USM+APM+Compatibility#.NET-Tracer-configuration-file-formats

In addition, the customer had a valid entry that we were parsing as invalid, such as:
"DD_RUNTIME_METRICS_ENABLED": true

Add this entry to the top level block.

Make a connection to the site.

YOu can check that the appropriate tag(s) have been added by hitting the HTTP information endpoint:

(from the source tree, download NamedPipeCmd.ex)
.\NamedPipeCmd.exe -method GET -path /network_tracer/debug/http_monitoring -quiet |convertfrom-json

YOu should see output such as:

Client : @{IP=::1; Port=80}
Server : @{IP=::1; Port=62700}
DNS :
Path : /
Method : GET
ByStatus : @{200=}
StaticTags : 0
DynamicTags : {http.iis.app_pool:DefaultAppPool, http.iis.site:1, http.iis.sitename:Default Web Site}
with the addition of service, env, and or version tags that match what was configured in the file that you applied.

Possible Drawbacks / Trade-offs

[agent-platform-auto-pr]

[Fast Unit Tests Report]

On pipeline 48376905 (CI Visibility). The following jobs did not run any unit tests:

Jobs:

• tests_deb-arm64-py3
• tests_deb-x64-py3
• tests_flavor_dogstatsd_deb-x64
• tests_flavor_heroku_deb-x64
• tests_flavor_iot_deb-x64
• tests_rpm-arm64-py3
• tests_rpm-x64-py3

If you modified Go files and expected unit tests to run in these jobs, please double check the job logs. If you think tests should have been executed reach out to #agent-devx-help

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv create-vm --pipeline-id=48376905 --os-family=ubuntu

Note: This applies to commit 07eaf9b

[derekwbrown]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in main is 23m.

Use /merge -c to cancel this operation!