build: add generator steps for bluetooth #7345

Job	Run time
1/6 chromedriver-headless	4m 3s
2/6 chromedriver-headless	3m 17s
3/6 chromedriver-headless	3m 19s
4/6 chromedriver-headless	3m 8s
5/6 chromedriver-headless	3m 7s
6/6 chromedriver-headless	3m 19s
1/6 chromedriver-headful	4m 7s
2/6 chromedriver-headful	3m 34s
3/6 chromedriver-headful	3m 33s
4/6 chromedriver-headful	3m 11s
5/6 chromedriver-headful	3m 4s
6/6 chromedriver-headful	3m 26s
1/6 mapper-headless	6m 20s
2/6 mapper-headless	5m 49s
3/6 mapper-headless	5m 35s
4/6 mapper-headless	4m 26s
5/6 mapper-headless	3m 58s
6/6 mapper-headless	5m 0s
[Required] WPT sink	1s
WPT report	0s
Update WPT expectations (if required)	0s
Commit updated expectations	0s
	1h 12m 17s

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