postgres: DBM full service fallback w/ prepared statements

[tlhunter]

What does this PR do?

• when DBM is set to full service
  • the DBM comment falls back to service mode
  • but only when sending a prepared statement

Motivation

• without this, each prepared statement query is technically different
  • this causes the pg library to fail as it does an exact string check of the query
  • ideally the pg library would somehow parse out and not consider comments
• at any rate this brings parity with other tracer implementations
• see Can't use prepared statements if a unique comment prepended to the query every time brianc/node-postgres#2735
• previously attempted in 0ff9465

Plugin Checklist

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

[github-actions]

Overall package size

Self size: 4.18 MB
Deduped: 58.38 MB
No deduping: 58.43 MB

Dependency sizes

name	version	self size	total size
@datadog/pprof	2.2.1	14.24 MB	15.12 MB
@datadog/native-iast-taint-tracking	1.4.1	14.85 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
protobufjs	7.1.2	2.76 MB	6.55 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.3.8	88.2 kB	118.6 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
ipaddr.js	2.0.1	59.52 kB	59.52 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.5	34.34 kB	38.81 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
retry	0.10.1	27.44 kB	27.44 kB
lodash.uniq	4.5.0	25.01 kB	25.01 kB
limiter	1.1.5	23.17 kB	23.17 kB
lodash.kebabcase	4.1.1	17.75 kB	17.75 kB
lodash.pick	4.4.0	16.33 kB	16.33 kB
node-abort-controller	3.0.1	14.33 kB	14.33 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
diagnostics_channel	1.1.0	7.07 kB	7.07 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
methods	1.1.2	5.29 kB	5.29 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

Merging #3186 (ed12728) into master (d638b4b) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3186      +/-   ##
==========================================
- Coverage   86.57%   86.54%   -0.03%     
==========================================
  Files         333      331       -2     
  Lines       11934    11894      -40     
  Branches       33       33              
==========================================
- Hits        10332    10294      -38     
+ Misses       1602     1600       -2     

Impacted Files	Coverage Δ
packages/datadog-plugin-pg/src/index.js	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[pr-commenter]

Benchmarks

Comparing candidate commit ed12728 in PR branch tlhunter/dbm-pg-prepared-statements with baseline commit d638b4b in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 446 metrics, 26 unstable metrics.

[tlhunter]

This was actually an example of the bug happening. The previous test had a name and was therefore a prepared statement. The test asserts that the traceparent is present in the comment but it should actually not be present.