The person or team who made the discovery should receive thanks.
Yes, if the breakthrough was a collaborative effort, then all individuals involved should receive thanks.
Yes, funding agencies play a crucial role in supporting and enabling scientific research, so they should receive thanks for their contributions.
Yes, colleagues who provided support, whether it be through advice, resources, or assistance, should be acknowledged and thanked for their contributions.
It is not necessary to thank the entire scientific community, but it is important to acknowledge and recognize the impact and significance of the discovery within the scientific community.