SqlServerMemory: Fix so auto memory on Azure VMs is reported correctly

[ejleroy]

Updated Cim Class to Win32_ComputerSystem (instead of Win32_PhysicalMemory) because the correct memory size was not being detected correctly on Azure VMs

Fixes #914

Pull Request (PR) description

This Pull Request (PR) fixes the following issues

Task list

• Added an entry under the Unreleased section in the CHANGELOG.md? Entry
  should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md?
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help?
• Comment-based help added/updated?
• Localization strings added/updated in all localization files as appropriate?
• Examples appropriately added/updated?
• Unit tests added/updated?
  See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible)?
  See DSC Resource Testing Guidelines.
• New/changed code adheres to
  DSC Resource Style Guidelines
  and Best Practices?

---

This change is 

[codecov-io]

Codecov Report

Merging #1154 into master will decrease coverage by <1%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1154   +/-   ##
======================================
- Coverage      97%     97%   -1%     
======================================
  Files          33      33           
  Lines        4005    4005           
======================================
- Hits         3916    3898   -18     
- Misses         89     107   +18

[johlju]

@ejleroy Many thanks for your contribution and fixing this issue!

---

Reviewed 1 of 1 files at r1.
Review status: all files reviewed, 2 unresolved discussions (waiting on @ejleroy)

---

a discussion (no related file):
The tests are failing could you please look at resolving those? I can't merge until the tests are passing. Thanks!
https://ci.appveyor.com/project/PowerShell/sqlserverdsc/build/9.0.369.0?fullLog=true#L4470

---

a discussion (no related file):
Could you please add an descriptive entry, for each change/issue, to the Unreleased section of the change log in the file README.md? If an entry resolves an issue please reference the issue where applicable. You may suffix (it's optional) each entry with your name. Example of the format for the entry.

* Descriptive entry ([issue #123](https://github.com/PowerShell/xPSDesiredStateConfiguration/issues/123). [Name/Alias (@github_account)](https://github.com/github_account)

---

Comments from Reviewable

[johlju]

@ejleroy FYI. This particular problem in the tests is not caused by this PR 🤔 I will open a new issue for this.
https://ci.appveyor.com/project/PowerShell/sqlserverdsc/build/9.0.369.0?fullLog=true#L7771

[msftclas]

All CLA requirements met.

[ejleroy]

@johlju Added the below changes to the CHANGELOG.md in unreleased section

• Changes to SqlServerMemory
  • Using Get-CimInstance -ClassName Win32_ComputerSystem).TotalPhysicalMemory
    (issue #1154)

[johlju]

For me to be able to merge this change, then please

• Sign the CLA (see comment above).
• Rebase the PR to get the latest changes (I merged a fix for one of the failing tests that is not part of your code change).
• Resolve the failing tests; https://ci.appveyor.com/project/PowerShell/sqlserverdsc/build/9.0.372.0?fullLog=true#L4469

There are merge conflicts since your PR was not based on the latest changes. Could you please rebase against branch dev using git rebase (not by using git pull or git merge, to keep the commit history). If you don't know how to rebase your local dev and working branch, please look at how to Resolve merge conflicts.
Let me know if you need any assistance.

[ejleroy]

@johlju Rebased and recommitted the fix. Test just kicked off and waiting for success.

[johlju]

Please resolve the failing tests here https://ci.appveyor.com/project/PowerShell/sqlserverdsc/build/9.0.373.0?fullLog=true#L4510 and here https://ci.appveyor.com/project/PowerShell/sqlserverdsc/build/9.0.373.0?fullLog=true#L1684

[stale]

Labeling this pull request (PR) as abandoned since it has gone 14 days or more since the last update. An abandoned PR can be continued by another contributor. The abandoned label will be removed if work on this PR is taken up again.

[johlju]

Closing this PR as it has been opened a new PR.