test(client-cloudwatch-logs): pass logGroupNamePrefix in describeLogGroups

[trivikr]

Issue #, if available:
Refs: aws/aws-sdk-js#3538

Description of changes:
Passes logGroupNamePrefix in describeLogGroups in client-cloudwatch-logs integration tests.

The test fails if there are more than 50 logGroups, as it parses logGroups from
first page of results. This code change explicitly requests for the created logGroup
to ensure it doesn't return pages of results.

Verified that integration tests are successful:

$ yarn test:integration-legacy --tags @cloudwatchlogs 
yarn run v1.22.5
$ cucumber-js --fail-fast --tags @cloudwatchlogs
..........

2 scenarios (2 passed)
6 steps (6 passed)
0m00.095s
Done in 2.80s.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-io]

Codecov Report

Merging #1708 (840336a) into master (de75f7e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1708      +/-   ##
==========================================
- Coverage   79.77%   79.76%   -0.02%     
==========================================
  Files         325      329       +4     
  Lines       12087    12575     +488     
  Branches     2553     2672     +119     
==========================================
+ Hits         9643    10030     +387     
- Misses       2444     2545     +101     

Impacted Files	Coverage Δ
...tocol_tests/aws-restxml/commands/XmlMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...col_tests/aws-restjson/commands/JsonMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlAttributesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlNamespacesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
... and 110 more

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