Script to find upgradeable patterns

[spier]

In a previous Board report we had discussed a plan to level up as many L1 pattern as possible to L2, to give them exposure to a wider audience (as the L2 patterns are published in our book).

To get a more reliable way to identify these patters, I wrote a script to find upgradeable patterns based on their number of Known Instances.

Warning: The number of Known Instances are only one of the requirement for our patterns to reach the next level.
Therefore running the script alone is not enough. Reading the pattern and the level requirements in detail is still required to decide whether or not a pattern can be pushed to the next level.

Main implementation steps:

• /meta/scripts/find_upgradeable_patterns.rb - Script to identify upgradeable patterns based on their number of Known Instances
• Formatting changes to the 'Known Instances' section of some patterns. Allows for easier scanning of the new find_upgradeable_patterns.rb script. (the script expects a bullet list of company names)

[spier]

@robtuley as we discussed the topic of "upgradeable patterns" as part of a previous Board report, you may find this interesting.

This is the output of the script explained above:

$ ruby find_upgradeable_patterns.rb

## Initial => Structured
## 1-Initial patterns primed for upgrade to 2-Structured (based on Known Instances only)
1 | ../../patterns/1-initial/innersource-guidance-group.md
1 | ../../patterns/1-initial/innersource-customer-interview-questions.md
2 | ../../patterns/1-initial/balancing-openness-and-security.md
1 | ../../patterns/1-initial/source-code-inventory.md
1 | ../../patterns/1-initial/incubator-pipeline.md
1 | ../../patterns/1-initial/include-product-owners.md
1 | ../../patterns/1-initial/introducing-metrics-in-innersource.md
1 | ../../patterns/1-initial/modular-code.md
1 | ../../patterns/1-initial/contained-innersource.md
1 | ../../patterns/1-initial/transitioning-contractor-code-to-innersource-model.md
1 | ../../patterns/1-initial/governance-levels.md

## Structured => Validated
## 2-Structured patterns primed for upgrade to 3-Validated (based on Known Instances only)
3 | ../../patterns/2-structured/30-day-warranty.md
5 | ../../patterns/2-structured/transparent-cross-team-decision-making-using-rfcs.md
3 | ../../patterns/2-structured/document-your-guiding-principles.md
3 | ../../patterns/2-structured/trusted-committer.md
3 | ../../patterns/2-structured/core-team.md
3 | ../../patterns/2-structured/maturity-model.md
5 | ../../patterns/2-structured/innersource-portal.md
3 | ../../patterns/2-structured/gig-marketplace.md
3 | ../../patterns/2-structured/project-setup/base-documentation.md
3 | ../../patterns/2-structured/project-setup/communication-tooling.md

[spier]

As this PR is not introducing any significant changes to the content in our book, I am confident that I can merge this without review.

@yuhattor if you have a moment, I would appreciate if you could try to run the script in /meta/scripts/find_upgradeable_patterns.rb, just to confirm that it works for others too.