allow Nix builds by not calling git in isGitRepo for Nimble (#23515)

Because `isGitRepo()` call requires `/bin/sh` it will always fail when
building Nim in a Nix build sandbox, and the check doesn't even make
sense if Nix already provides Nimble source code.

Since for Nimble `allowBundled` is set to `true` this effectlvely does
not change behavior for normal builds, but does avoid ugly hacks when
building in Nix which lacks `/bin/sh` and fails to call `git`.

Reference:
*
https://github.com/status-im/nimbus-eth2/pull/6180#discussion_r1570237858

Signed-off-by: Jakub Sokołowski <jakub@status.im>

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