fix error when using pubsub while plugin is disabled

[rochdev]

What does this PR do?

Fix error when using pubsub while plugin is disabled.

Motivation

Fix #2962

[github-actions]

Overall package size

Self size: 4.01 MB
Deduped: 59.61 MB
No deduping: 59.65 MB

Dependency sizes

name	version	self size	total size
@datadog/native-iast-taint-tracking	1.3.1	13.47 MB	13.47 MB
@datadog/pprof	2.1.0	12.31 MB	13.2 MB
@datadog/native-appsec	2.0.0	12.33 MB	12.34 MB
@datadog/native-metrics	1.5.0	7.1 MB	7.11 MB
protobufjs	7.1.2	2.76 MB	6.55 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
opentracing	0.14.7	194.81 kB	194.81 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
semver	5.7.1	61.58 kB	61.58 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	1.3.4	32.7 kB	37.17 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 #2966 (1e98f65) into master (deda0c8) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2966      +/-   ##
==========================================
- Coverage   87.64%   87.63%   -0.01%     
==========================================
  Files         327      329       +2     
  Lines       11746    11747       +1     
  Branches       33       33              
==========================================
  Hits        10295    10295              
- Misses       1451     1452       +1     

Impacted Files	Coverage Δ
...atadog-instrumentations/src/google-cloud-pubsub.js	94.11% <100.00%> (ø)

... and 6 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 1e98f65 in PR branch fix-pubsub-v1-error with baseline commit deda0c8 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 669 metrics, 39 unstable metrics.

[rochdev]

The failing system test is unrelated to this PR.