Improve nextjs tests flakyness

[uurien]

What does this PR do?

In nextjs tests, instead of start the tests with the first log message, it waits until the message with port number or Ready in.
It is done in this way because different tests shows different messages when the server has been started:

> { address: '127.0.0.1', family: 'IPv4', port: 35947 }

> Listening on port 45469 url: http://127.0.0.1:45469/

>  ✓ Ready in 75ms

Motivation

Improve nextjs tests flakyness

Plugin Checklist

• Unit tests.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CircleCI jobs/workflows.
• Plugin is exported.

Additional Notes

[github-actions]

Overall package size

Self size: 6.71 MB
Deduped: 61.96 MB
No deduping: 62.24 MB

Dependency sizes

name	version	self size	total size
@datadog/native-appsec	8.0.1	15.59 MB	15.6 MB
@datadog/native-iast-taint-tracking	2.1.0	14.91 MB	14.92 MB
@datadog/pprof	5.3.0	9.85 MB	10.22 MB
protobufjs	7.2.5	2.77 MB	6.56 MB
@datadog/native-iast-rewriter	2.3.1	2.15 MB	2.24 MB
@opentelemetry/core	1.14.0	872.87 kB	1.47 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
@opentelemetry/api	1.8.0	1.21 MB	1.21 MB
import-in-the-middle	1.7.4	70.19 kB	739.86 kB
msgpack-lite	0.1.26	201.16 kB	281.59 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.5.4	93.4 kB	123.8 kB
pprof-format	2.1.0	111.69 kB	111.69 kB
@datadog/sketches-js	2.1.0	109.9 kB	109.9 kB
lodash.sortby	4.7.0	75.76 kB	75.76 kB
lru-cache	7.14.0	74.95 kB	74.95 kB
ignore	5.2.4	51.22 kB	51.22 kB
int64-buffer	0.1.10	49.18 kB	49.18 kB
shell-quote	1.8.1	44.96 kB	44.96 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
tlhunter-sorted-set	0.1.0	24.94 kB	24.94 kB
limiter	1.1.5	23.17 kB	23.17 kB
dc-polyfill	0.1.4	23.1 kB	23.1 kB
retry	0.13.1	18.85 kB	18.85 kB
jest-docblock	29.7.0	8.99 kB	12.76 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
module-details-from-path	1.0.3	4.47 kB	4.47 kB

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.43%. Comparing base (5278b1c) to head (2027226).
Report is 4 commits behind head on master.

❗ Current head 2027226 differs from pull request most recent head 74ac253

Please upload reports for the commit 74ac253 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4411      +/-   ##
==========================================
- Coverage   80.42%   71.43%   -9.00%     
==========================================
  Files           3      116     +113     
  Lines         373     4162    +3789     
  Branches       33       33              
==========================================
+ Hits          300     2973    +2673     
- Misses         73     1189    +1116     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-06-18 16:07:31

Comparing candidate commit 74ac253 in PR branch ugaitz/fixing-next-flaky-test with baseline commit 3b479d0 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 260 metrics, 6 unstable metrics.