Add e2e to pdh_check

[ChristineTChen]

What does this PR do?

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• 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)
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• Feature or bugfix must have tests
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[ofek]

Also, I believe you'll need a local interface for dd_environment like

integrations-core/cassandra_nodetool/tests/conftest.py

Line 46 in 3f725d2

yield common.CONFIG_INSTANCE, 'local'

[hithwen]

Add skip if not windows, otherwise I get

ddev env test pdh_check -ne
Setting up environment `py27`... failed!
Stopping the environment...
The environment `py27` does not support this platform.

[ofek]

Fixed by #4398

[ofek]

  Running Checks
  ==============

    pdh_check (1.6.1)
    -----------------
      Instance ID: pdh_check:de68c6f531f4b15d [OK]
      Configuration Source: file:C:\ProgramData\Datadog\conf.d\pdh_check.d\pdh_check.yaml
      Total Runs: 1
      Metric Samples: Last Run: 2, Total: 2
      Events: Last Run: 0, Total: 0
      Service Checks: Last Run: 0, Total: 0
      Average Execution Time : 214ms

CI

[codecov]

Codecov Report

Merging #4393 into master will increase coverage by 15.28%.
The diff coverage is 80%.

Impacted Files	Coverage Δ
pdh_check/tests/test_pdh_check.py	100% <100%> (ø)	⬆️
pdh_check/tests/common.py	100% <100%> (ø)
pdh_check/tests/test_e2e.py	71.42% <71.42%> (ø)
pdh_check/tests/conftest.py	75% <75%> (ø)
disk/datadog_checks/disk/__init__.py
...checks_dev/tests/plugin/test_environment_runner.py
datadog_checks_base/tests/test_similar.py
win32_event_log/tests/test_check.py
...service/datadog_checks/windows_service/__init__.py
..._checks_base/datadog_checks/base/checks/network.py
... and 160 more