Fix tool pull bad-sad for unauthorized response

[gayaldassanayake]

Purpose

When the settings.toml contains an incorrect access token, a BadSadError is produced during bal tools.

$ bal tool pull gayals

ballerina: Oh no, something really went wrong. Bad. Sad.

We appreciate it if you can report the code that broke Ballerina in
https://github.com/ballerina-platform/ballerina-lang/issues with the
log you get below and your sample code.

We thank you for helping make us better.

[2023-06-20 10:43:10,494] SEVERE {b7a.log.crash} - closed
java.lang.IllegalStateException: closed
	at okio.RealBufferedSource.select(RealBufferedSource.kt:83)
	at okhttp3.internal.Util.bomAwareCharset(Util.java:467)
	at okhttp3.ResponseBody.string(ResponseBody.java:181)
	at org.ballerinalang.central.client.CentralAPIClient.handleUnauthorizedResponse(CentralAPIClient.java:1521)
	at org.ballerinalang.central.client.CentralAPIClient.pullTool(CentralAPIClient.java:701)
	at io.ballerina.cli.cmd.ToolCommand.pullToolFromCentral(ToolCommand.java:346)
	at io.ballerina.cli.cmd.ToolCommand.handlePullCommand(ToolCommand.java:239)
	at io.ballerina.cli.cmd.ToolCommand.execute(ToolCommand.java:165)
	at java.base/java.util.Optional.ifPresent(Optional.java:183)
	at io.ballerina.cli.launcher.Main.main(Main.java:56)

This happens because the response body is already read for verbose printing and when it is re-read for printing the error, the body is empty.
This PR uses the initially read error for the error printing to avoid this.

Related to #40264

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.49 ⚠️

Comparison is base (bbc591e) 76.93% compared to head (e6f1541) 76.44%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #40775      +/-   ##
============================================
- Coverage     76.93%   76.44%   -0.49%     
- Complexity    53747    55276    +1529     
============================================
  Files          3332     3386      +54     
  Lines        200289   208252    +7963     
  Branches      25654    26955    +1301     
============================================
+ Hits         154086   159195    +5109     
- Misses        37819    40282    +2463     
- Partials       8384     8775     +391     

Impacted Files	Coverage Δ
...ballerinalang/central/client/CentralAPIClient.java	37.04% <0.00%> (-11.72%)	⬇️

... and 570 files with indirect coverage changes

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