Set 'gc.autoDetach' to false to be executed 'git gc' in the foreground by some git commands

[ffjlabo]

What this PR does / why we need it:
Set 'gc.autoDetach' to false to be executed 'git gc' in the foreground by some git commands
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):

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (8e302a8) 31.04% compared to head (fabae49) 31.04%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
pkg/git/client.go	70.00%	2 Missing and 1 partial ⚠️
pkg/git/repo.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4761      +/-   ##
==========================================
- Coverage   31.04%   31.04%   -0.01%     
==========================================
  Files         225      225              
  Lines       26257    26273      +16     
==========================================
+ Hits         8152     8156       +4     
- Misses      17455    17464       +9     
- Partials      650      653       +3     

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[ffjlabo]

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

log↓

received a plan-preview command to handle	{"command": "c0c563fb-7a78-43d3-ad5e-8e45f0f7cbf8"}
start building planpreview result for command c0c563fb-7a78-43d3-ad5e-8e45f0f7cbf8	{"command": "c0c563fb-7a78-43d3-ad5e-8e45f0f7cbf8"}
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/gitcache651340412/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/gitcache651340412/ffjlabo-dev", "src": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/gitcache651340412/ffjlabo-dev", "dst": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/plan-preview-builder-1425043400/1752730028"}
setting gc.autoDetach	{"repo-id": "ffjlabo-dev", "remote": "XXX", "repo-cache-path": "/var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/gitcache651340412/ffjlabo-dev", "gc.autoDetach": true}
successfully reported a failure command	{"command": "c0c563fb-7a78-43d3-ad5e-8e45f0f7cbf8"}

git config of the repo cloned for plan-preview↓

% cd /var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/plan-preview-builder-1425043400/1752730028                    (git)-[main|merge]
% /var/folders/th/pq_q9v6j6_n_0fgx6v1_zp09_2tx_x/T/plan-preview-builder-1425043400/1752730028
% git config --get gc.autoDetach                                                                                    (git)-[main|merge]
true

[khanhtc1202]

Here you go 🪨

[t-kikuc]

GREAT🚀 🚀

[ffjlabo]

Ooops... I mistook the default value... not true but false... Sorry I will fix it 🙏