Mercurial Module: Pass the identity_path portion as own arg

[rallytime]

What does this PR do?

When we pass in an identity file to use with the --ssh option in the hg.py execution module, the ssh -i <identity file> portion needs to be passed along as its own arg in the list of command args passed cmd.run.

What issues does this PR fix or reference?

Fixes #36514

Previous Behavior

When using the mercurial sate with the identity option set, the state would fail because the --ssh "ssh -i /indentity/file" way of passing the command was tripping up the cmd.run call:

local:
----------
          ID: mercurial
    Function: hg.latest
        Name: ssh://hg@bitbucket.org/nickwilliams/influx-salt
      Result: False
     Comment: hg clone: invalid arguments
              hg clone [OPTION]... SOURCE [DEST]

              make a copy of an existing repository

              options:

               -U --noupdate          the clone will include an empty working copy (only a
                                      repository)
               -u --updaterev REV     revision, tag or branch to check out
               -r --rev REV [+]       include the specified changeset
               -b --branch BRANCH [+] clone only the specified branch
                  --pull              use pull protocol to copy metadata
                  --uncompressed      use uncompressed transfer (fast over LAN)
               -e --ssh CMD           specify ssh command to use
                  --remotecmd CMD     specify hg command to run on the remote side
                  --insecure          do not verify server certificate (ignoring web.cacerts
                                      config)

              [+] marked option can be specified multiple times

              use "hg help clone" to show the full help text
     Started: 21:55:07.034511
    Duration: 114.811 ms
     Changes:

Summary for local
------------
Succeeded: 0
Failed:    1
------------
Total states run:     1

New Behavior

The list of args are passed correctly to the cmd.run function and we no longer have an error.

Tests written?

No

Please review Salt's Contributing Guide for best practices.