Enable typeCast code action test

[lasinicl]

Description:
0376023
The above commit disabled the type cast code action test for https://github.com/ballerina-platform/ballerina-lang/blob/master/language-server/modules/langserver-core/src/test/resources/codeaction/type-cast/source/typeCast.bal#L34 since it is invalid according to the latest language changes. (using additive expressions with numeric values is disallowed when the static types of the operands belong to different basic types.)
Need to re-enable it

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[anupama-pathirage]

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