patch 9.1.2027: filetype: bicep filetype used for 2 bicep file types

patch 9.1.2027: filetype: bicep filetype used for 2 bicep file types

Problem:  filetype: bicep filetype used for 2 bicep file types
Solution: Detect *.bicepparam files as bicep-param filetype, include
          new bicep-params and bicep filetype plugin
          (Scott McKendry)

The bicep language server handles parameter files differently than
regular bicep files. Treating them the same at the editor level leads to
false positive diagnostics in the editor.

References:

Bicep Language Constants:
- https://github.com/Azure/bicep/blob/51392d32ca2c8b94b1bb7a255e78e1d559d12573/src/Bicep.Core/LanguageConstants.cs#L23
VS Code Extension definition:
- https://github.com/Azure/bicep/blob/51392d32ca2c8b94b1bb7a255e78e1d559d12573/src/vscode-bicep/package.json#L47

closes: #19026

Signed-off-by: Scott McKendry <me@scottmckendry.tech>
Signed-off-by: Christian Brabandt <cb@256bit.org>