RFR: 8278494: Remove .hgtags

[Ambarish Rapte]

On Thu, 9 Dec 2021 13:02:32 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Trivial fix to remove the obsolete `.hgtags` file from the repo. As mentioned in JBS, this file has (intentionally) not been updated since the switch to git. It will continue to be available in the `jfx17` branch [here](https://github.com/openjdk/jfx/blob/jfx17/.hgtags). The corresponding file was recently removed from the `jdk` repo.

Marked as reviewed by arapte (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/691