Enable Rider tests with 193 SDK

[sdubov]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Description

• Switch to 2019.3 SDK to verify Rider tests works (Rider tests run on local environment is available in 193 SDK only)
• Update travis and Amazon configuration to set the env variable

Motivation and Context

Enable tests.

Related Issue(s)

None.

Testing

Screenshots (if appropriate)

Checklist

• I have read the README document
• I have read the CONTRIBUTING document
• Local run of gradlew check succeeds
• My code follows the code style of this project
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #6 into feature/rider-support will increase coverage by 0.98%.
The diff coverage is 84.61%.

@@                     Coverage Diff                     @@
##             feature/rider-support       #6      +/-   ##
===========================================================
+ Coverage                     46.2%   47.19%   +0.98%     
- Complexity                     770      797      +27     
===========================================================
  Files                          220      222       +2     
  Lines                         7508     7514       +6     
  Branches                      1108     1106       -2     
===========================================================
+ Hits                          3469     3546      +77     
+ Misses                        3585     3511      -74     
- Partials                       454      457       +3

Flag	Coverage Δ	Complexity Δ
#unittest	47.19% <84.61%> (+0.98%)	797 <4> (+27)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...ns/services/lambda/dotnet/DotNetSamDebugSupport.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
...ftware/aws/toolkits/jetbrains/ui/RegionSelector.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
...jetbrains/settings/LambdaSettingsChangeListener.kt	100% <100%> (ø)	0 <0> (?)
.../aws/toolkits/jetbrains/settings/LambdaSettings.kt	90% <100%> (+12.22%)	4 <1> (+1)	⬆️
...s/toolkits/jetbrains/icons/RiderAwsIconsPatcher.kt	71.42% <50%> (+71.42%)	4 <2> (+4)	⬆️
...its/jetbrains/settings/LambdaGutterMarkSettings.kt	85.71% <85.71%> (ø)	1 <1> (?)
...ware/aws/toolkits/jetbrains/ui/ResourceSelector.kt	79.01% <0%> (-1.24%)	24% <0%> (ø)
...aws/toolkits/jetbrains/utils/CompatibilityUtils.kt	34.61% <0%> (ø)	7% <0%> (ø)	⬇️
... and 12 more

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