Autodesk: resolve TaskControllerSceneIndex compatibility issue

[erikaharrison-adsk]

Description of Change(s)

• This change will make TaskControllerSceneIndex be compatible with all storm based renderDelegate.
  • By using dynamic_cast() for testing instead of TfToken testing, this is the same behavior as original HdxTaskController.

Link to proposal (if applicable)

• N/A

Fixes Issue(s)

• N/A

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

• I have added unit tests that exercise this functionality (Reference:
  testing guidelines)

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement (Reference:
  Contributor License Agreement instructions)

[tpalmergit15]

Filed as internal issue #USD-11155

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[JustAlejandro]

We ended up re-implementing this change, so in the next release we'll include an isForStorm argument in HdxTaskControllerSceneIndex's constructor parameters rather than the current rendererPluginName argument. The parameter can then be set by calling a HdxIsStorm helper. This is intended to be temporary since we don't want scene indices to configure themselves based on render delegate, but is necessary for now.