fix(lambda): Revert update to function upload directory selection wizard

[rhamilt]

fixes #7618

Problem

Introduced in #7601 is a bug where choosing to upload a Lambda function from a directory would not allow the user to actually select the directory. In the directory selection window, the button to select is disabled. This was an inadvertent change when adding new functionality.

Solution

Revert the breaking change. In addition to switching canSelectFolders to true and canSelectFiles to false, I have reverted the other changes in the upload flow that were added in the original PR. This is because these changes added another flow to the upload modal that doesn't fit with all the other added functionality, and just increases the complexity of the code without much benefit. Because this was the only place that used the lambdaEdits array from the utils, I removed that as well.

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[roger-zhangg]

LGTM