Can't start Metals due to conflicting GC settings

[olafurpg]

Describe the bug

Metals crashes when starting in a workspace with .jvmopts that declares custom GC options

To Reproduce Steps to reproduce the behavior:

git clone monix/monix
code monix

Removing -XX:+UseConcMarkSweepGC from https://github.com/monix/monix/blob/baed192092b7c78624f0ea757d041909dda340e2/.jvmopts#L8 works around the issue.

Expected behavior

Metals should start like normal.

The bug lies here

metals-vscode/src/getJavaOptions.ts

Lines 54 to 56 in f8a49ba

	!line.startsWith("-Xms") &&
	!line.startsWith("-Xmx") &&
	!line.startsWith("-Xss")

Instead of blacklisting memory options, we should consider whitelisting only HTTP proxy settings.

[olafurpg]

An alternative solution is to remove the default GC settings in

metals-vscode/src/extension.ts

Lines 185 to 186 in f8a49ba

	`-XX:+UseG1GC`,
	`-XX:+UseStringDeduplication`

Those were added when Metals used 20-40x more memory than it does now.