Bugfix 3871 workflow concurrency

[Mzack9999]

Proposed changes

This PR attempts to mitigate nested template execution within a workflow context by increasing the concurrency of the sizedwaitgroup structure by one unit.

Notes:

• This operation should be done at each nested level where the template being executed is a workflow, but this should cover most cases.
• A better approach is switching back to a declarative execution (as in the old PR improved workflow logic #142)

Example

$ cat test-workflow.yaml
id: test-workflow

info:
  name: test-workflow
  author: aaa
  severity: info
  description: test


workflows:
  - template: baidu.yaml
    matchers:
      - name: baidu-detect
        subtemplates:
          - template: ali.yaml

$ cat ali.yaml
id: ali

info:
  name: ali
  author: aaa
  severity: info
  description: test

http:
  - method: GET
    path:
      - "{{BaseURL}}"

    host-redirects: true
    max-redirects: 2
    matchers:
      - type: word
        name: ali-detect
        words:
          - "ali.com"
        part: body

$ cat baidu.yaml
id: baidu

info:
  name: baidu
  author: aaa
  severity: info
  description: test

http:
  - method: GET
    path:
      - "{{BaseURL}}"

    host-redirects: true
    max-redirects: 2
    matchers:
      - type: word
        name: baidu-detect
        words:
          - "baidu"
        part: body

$ go run . -w test-workflow.yaml -u  http://baidu.com -c 1          

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v2.9.8

                projectdiscovery.io

[WRN] Found 24 template[s] loaded with deprecated paths, update before v3 for continued support.
[INF] Current nuclei version: v2.9.8 (latest)
[INF] Current nuclei-templates version: v9.5.4 (latest)
[INF] Workflows loaded for current scan: 1
[INF] Targets loaded for current scan: 1
[INF] No results found. Better luck next time!

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[RamanaReddy0M]

lgtm!

From ^example:

 go run . -w workflow-test.yaml -u  http://baidu.com -c 1 -dreq

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v2.9.8

                projectdiscovery.io

[INF] Current nuclei version: v2.9.8 (outdated)
[INF] Current nuclei-templates version: v9.5.4 (latest)
[INF] Workflows loaded for current scan: 1
[INF] Targets loaded for current scan: 1
[INF] [baidu] Dumped HTTP request for http://baidu.com

GET / HTTP/1.1
Host: baidu.com
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2224.3 Safari/537.36
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip

[INF] No results found. Better luck next time!