fix: buildCurlRequest() replace req.Body with req.GetBody()

[tttturtle-russ]

The `TestGenerateExecutedCurl` failure started after I merged from branch `v2` to branch `main`. It needs to investigate why it's failing.

Originally posted by @jeevatkm in #827 (comment)

Hi jeevatkm, I've found the reason why the test case failed.
In

resty/client.go

Line 1601 in 6d941ac

resp, err := c.httpClient.Do(req.RawRequest)

Do method will read the req.RawRequest.Body and make it empty. When generating curl body it will read an empty string, and that's why it failed.

This commit offers a temporary solution to this problem, I think the ultimate solution is to add a Clone method in Request, as #718 describes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.67%. Comparing base (82ae758) to head (24ae356).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #844      +/-   ##
==========================================
- Coverage   96.89%   96.67%   -0.22%     
==========================================
  Files          14       13       -1     
  Lines        1773     2048     +275     
==========================================
+ Hits         1718     1980     +262     
- Misses         35       46      +11     
- Partials       20       22       +2     

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[jeevatkm]

@tttturtle-russ Let's decline this PR and create a new PR with adding middleware would solve. Also, while on PR #842, I noticed, the CURL follow needs an improvement I will work on later.

[jeevatkm]

@tttturtle-russ Thanks for creating a PR. Last night, I discovered the branch main was missing curl middleware. It seems it happened when I merged the branch v2 into branch main.

Branch main

resty/resty.go

Lines 195 to 196 in 6d941ac

	addCredentials,
	}

Branch v2

resty/client.go

Lines 1484 to 1486 in 370d744

	addCredentials,
	createCurlCmd,
	}

[tttturtle-russ]

@jeevatkm OK, I will close this PR and create a new one with curl middleware added.