MB-68545[BP]: Fix eshell after migrating to erlang 26

Note: this BP depends on Erlang/OTP 26, so should ideally be merged at
the same time that as the tlm change to upgrade to OTP 26.

Original commit message below:
-----------------------------

We set cookie in code passed via -eval and I guess there is a race
between executing -eval and -remsh. If remsh is executed first,
then cookie will not be set by the time of connect.

This fix explicitly sets the order for those operarations:
we set the cookie first, and then start the remote shell.

Change-Id: Ie9cd9ee6b5561d2e07ee25b57f3db3787bcf42eb
Reviewed-on: https://review.couchbase.org/c/couchbase-cli/+/233928
Reviewed-by: Matt Hall <matt.hall@couchbase.com>
Tested-by: Safian Ali <safian.ali@couchbase.com>
Well-Formed: Restriction Checker

Author: timofey-barmin

cbmgr.py

@@ -2149,9 +2149,12 @@ def execute(self, opts):
             env = os.environ.copy()
             env["CB_COOKIE"] = cookie
 
+            eval_str = 'erlang:set_cookie(list_to_atom(os:getenv("CB_COOKIE"))), ' \
+                       f'shell:start_interactive({{remote, "{node}"}}).'
             args = [path, '-name', name, '-setcookie', 'nocookie', '-hidden', '-eval',
-                    'erlang:set_cookie(node(), list_to_atom(os:getenv("CB_COOKIE"))).',
-                    '-remsh', node, '-proto_dist', 'cb', '-epmd_module', 'cb_epmd', '-pa', CB_NS_EBIN_PATH, '-kernel',
+                    eval_str,
+                    '-noshell', '-proto_dist', 'cb', '-epmd_module',
+                    'cb_epmd', '-pa', CB_NS_EBIN_PATH, '-kernel',
                     'dist_config_file', f'"{temp_name}"'] + CB_INETRC_OPT
 
             if opts.debug: