Add emphasis to entrypoint TreeItem in Files #3553

Job	Run time
home-view-unit-tests / lint	17s
lint / lint	1m 14s
agent / native (macos-latest)	47s
build / build	1m 32s
agent / native (windows-latest)	52s
agent / native (ubuntu-latest)	21s
vscode / native (macos-latest)	51s
vscode / native (windows-latest)	4m 34s
vscode / native (ubuntu-latest)	1m 19s
package / vscode	4m 16s
bats / native (ubuntu-latest)	4m 59s
archive / archive	32s
upload / upload	1m 12s
vscode-ui / ui-tests (ubuntu-latest)	6m 35s
	29m 21s

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