Disable gc.autoDetach by default

[ffjlabo]

What this PR does / why we need it:

Set gc.autoDetach to false by default.
I mistook the default value, not true but false on PR #4761

Which issue(s) this PR fixes:

Fixes #4760

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[ffjlabo]

✅ tested the behavior of cloning a repo, especially with pipectl plan-preview on local

received a plan-preview command to handle	{"command": "c9812ced-0b8e-4acc-9d91-ae3ebce48e6c"}
start building planpreview result for command c9812ced-0b8e-4acc-9d91-ae3ebce48e6c	{"command": "c9812ced-0b8e-4acc-9d91-ae3ebce48e6c"}
cloning ffjlabo-dev for the first time	{"repo-id": "ffjlabo-dev", "remote": "XXX", "repo-cache-path": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/gitcache4050105689/ffjlabo-dev"}
cloning a repo from cached one in local	{"repo-id": "ffjlabo-dev", "remote": "XXX", "repo-cache-path": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/gitcache4050105689/ffjlabo-dev", "src": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/gitcache4050105689/ffjlabo-dev", "dst": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/plan-preview-builder-3616880621/2748758883"}
setting gc.autoDetach	{"repo-id": "ffjlabo-dev", "remote": "XXX", "repo-cache-path": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/gitcache4050105689/ffjlabo-dev", "gc.autoDetach": false}
successfully reported a failure command	{"command": "c9812ced-0b8e-4acc-9d91-ae3ebce48e6c"}

git config of the repo cloned for plan-preview↓

% cd /var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/plan-preview-builder-3616880621/2748758883
% git config --get gc.autoDetach                                                                                   
false

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ea9a453) 31.02% compared to head (5f2c792) 31.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4772   +/-   ##
=======================================
  Coverage   31.02%   31.02%           
=======================================
  Files         225      225           
  Lines       26353    26353           
=======================================
  Hits         8175     8175           
  Misses      17525    17525           
  Partials      653      653           

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[t-kikuc]

good!

[khanhtc1202]

Thanks