fix(response-rewrite): rewrite response code using ctx.var

[zhendongcmss]

Description

I find that if I use logger plugin(clickhouse-logger) to send the access logs, the http code doesn't rewrited by response-rewrite plugin, because log-util.lua use ctx.var get the status not ngx.status.

https://github.com/apache/apisix/blob/master/apisix/utils/log-util.lua#L63

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[Sn0rt]

Are existing tests covered?

[zhendongcmss]

Are existing tests covered?

There no clickhouse DB, it is hard to add test case. Do you have idea ?

[pixeldin]

Are existing tests covered?

There no clickhouse DB, it is hard to add test case. Do you have idea ?

You may running the unit test code with test-nginx framework refer to this:
https://github.com/apache/apisix/blob/dcb315bca4617cf76b9a6d2a0f2b62612d535a58/t/plugin/clickhouse-logger2.t#LL36C27-L36C27

[monkeyDluffy6017]

Hi @zhendongcmss, it looks that your test cases have failed

[zhendongcmss]

Hi @zhendongcmss, it looks that your test cases have failed

updated

[monkeyDluffy6017]

@zhendongcmss still failed

[monkeyDluffy6017]

@zhendongcmss Please make the ci pass

[monkeyDluffy6017]

@leslie-tsang please help to fix this pr

[github-actions]

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[github-actions]

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